JP2000163054A - Music joint practice device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct an efficient joint practice while plural persons are gathered in one place and conduct a joint practice of a musical performance such as a chorus and an ensemble. SOLUTION: A lead music means 1 simultaneously outputs the signals that indicate a lead music for each part in a music to be practiced for each part in parallel. An obtaining means 2, for example a microphone, obtains the contents of a joint performance that is performed by the players of each part of the music as performance signals. Synthesizing means 3a, 3b, 3c and 3d individually synthesize, for example mix, the signals indicating a lead music of each part with all parts of performance signals. Output means 4a, 4b, 4c and 4d, for example earphones, individually output the synthesized outputs of the means 3a, 3b, 3c and 3d. Each part 5a, 5b, 5c and 5d simultaneously conducts a performance practice for each part based on the lead music. Moreover, a joint practice is conducted while providing a total balance for the performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for an apparatus used for practicing music, and more particularly, to a technique used when a plurality of people come together to perform a music practice such as chorus or ensemble. In particular, the present invention relates to a technology of a device that can perform an efficient joint practice.

[0002]

2. Description of the Related Art In the practice of chorus and ensemble music, it is essential that people in charge of each part (melody) come together to practice chorus and ensemble. Needless to say.

Hereinafter, a case of chorus practice will be described as an example. In chorus practice, it is common that the practice for each part is performed before performing the joint practice. In practice for each part,
While listening to the music score of the song and listening to the performance of the part on the piano or the like, the user repeatedly practices the so-called part and learns the sound to be uttered. After that, all the parts are assembled and the song is actually sung, so-called sound tuning practice is performed as a joint practice, but by the time this sound tuning is done, sound picking has already been finished for each part (Proficient) is strongly required.

[0004] In a joint practice field, even if all parts are assembled in the practice field, the practice of sound tuning is not immediately performed, but it is usual to practice each part first. In the practice for each part at this time, the area of the practice field enough to not affect the practice of the other parts and a sufficient number of instruments such as pianos for the practice for each part are secured, Ideally, practice for each part can be performed in parallel.
However, reality is far from ideal, and while practicing one part, the other part is often taking a break,
He was wasting practice time and was not efficient.

[0005] In view of the above problems, it is an object of the present invention to enable efficient joint practice when a plurality of people gather together to practice joint music performances such as chorus and ensemble. It is a subject to be.

[0006]

FIG. 1 is a block diagram showing the principle configuration of the present invention. The figure shows charge 5 for each part.
a, 5b, 5c, and 5d show the principle configuration of a music joint practice apparatus for performing joint practice.
It comprises an acquisition means 2, synthesis means 3a, 3b, 3c, 3d and output means 4a, 4b, 4c, 4d.

In the principle configuration shown in FIG. 1, a music piece having four parts is played by four part staffs 5a, 5b,
Since 5c and 5d show a configuration for performing joint training, the number of parts output by the lead music means 1, the synthesizing means 3a, 3b, 3c and 3d, and the output means 4a, 4b, 4
The number of c and 4d is set to 4, and the present invention may be configured such that these numbers are increased or decreased in accordance with the number of parts of the music to be practiced or the number of persons in charge of each part.

[0008] In this specification, "performance" means
This means not only playing a musical instrument but also playing music widely, including, for example, singing a choral song.

In FIG. 1, a lead music means 1 outputs a signal (hereinafter, simply referred to as a lead music signal) indicating lead music, which is a model for each part in a music piece to be jointly practiced, for each part. Thus, the lead music signals of each part of the music are output simultaneously in parallel. As the lead music means 1, for example, a synthesizer and a sequencer are used, and a performance signal which is an output when an automatic performance is performed is output as a lead music signal.

[0010] The acquisition means 2 acquires the content of a joint performance performed by the person in charge of each part of the music as a performance signal. As the acquisition means 2, for example, a microphone that collects performance sounds emitted by the performance in charge of each part of the music and converts them into electric signals is used.

The synthesizing means 3a, 3b, 3c and 3d individually synthesize all parts of the performance signal obtained by the obtaining means 2 with the lead music signal for each part output from the lead music means 1, for example, mixing ( Mixing).

The output means 4a, 4b, 4c and 4d individually output the combined outputs of the combining means 3a, 3b, 3c and 3d. The manner in which the joint practice is performed using the music joint practice apparatus having the above configuration will be described with respect to the charge 5a of the music piece a. The charge 5a is output from the output means 4a, that is, output from the lead music means 1. The lead music signal serving as an example of the part a that is in charge of the user and the respective charge 5a, 5
b, 5c and 5d practice the performance of their own part 5a while obtaining a composite output with performance signals corresponding to the performance contents of all the performances. Therefore, when a joint practice is performed using this music joint practice apparatus, each person in charge can obtain a lead music signal, which is an example of his / her own performance only, for a lead music signal, and performs based on the lead music signal. Practice can be performed simultaneously for each person in charge. This feature of the present invention is particularly effective when practicing chorus while listening to lead music and performing singing practice simultaneously for each part.

Further, in the joint practice using this music joint practice apparatus, the entire picture of the performance sound emitted by the performance of all the persons in charge can be heard together, and each person in charge can balance the overall performance. You can practice the performance in consideration. In this case, if a microphone is used as the acquisition means 2, it is particularly useful because the entire image of the actual performance sound can be grasped from the standpoint of the audience listening to the performance. In this case, the synthesizing means 3a, 3b, 3c and 3d mix the lead music signal output from the lead music means 1 and the performance signal obtained by the obtaining means 2.

Further, in the configuration shown in FIG. 1, when the operator operating this music joint training apparatus instructs the lead music means 1 to start outputting the lead music signal, the instruction is given only for a predetermined time after the instruction is given. An output start delay means for delaying the start of output of the lead music signal may be further provided, so that the operator can instruct the start of the performance and then prepare for the performance, which is convenient. .

Further, if earphones are used for the output means 4a, 4b, 4c and 4d, the lead music signal sound of the own part from the lead music means 1 will be heard by the person in charge of the other part, and This can prevent the performance practice in charge from being hindered, and is particularly useful when performing a joint practice in a narrow practice space. In this specification, the term "earphone" refers to an electro-acoustic transducer generally formed so as to be acoustically tightly coupled to the ear, and is configured to fit into the ear canal, a so-called "earphone". Not only earphones but also broadly include so-called headphones configured to be held in the ears by a headband or the like.

In the music training apparatus having the principle configuration shown in FIG. 1, the tempo of the lead music indicated by the signal output from the lead music means 1 is changed according to the movement of the human body of the operator who operates the music training apparatus. May be further provided with a tempo changing means for changing the tempo. In this configuration, for example, if the tempo of the lead music is changed in accordance with the movement of the conductor shaken by the conductor who is the operator of the present apparatus, each person in charge will output a lead music signal having a tempo corresponding to the conductor. You will be able to practice effectively in situations closer to actual performance on the actual stage according to the command.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing an overall configuration of a music joint practice device embodying the present invention. In addition,
Here, it is mainly for choral practice, and a description will be given of a music joint practice apparatus that can practice singing and singing songs simultaneously by four people, one for each of four parts (soprano, alto, tenor, bass). .

The music training apparatus shown in FIG.
1, work RAM 12, program ROM 13, song memory 14, SW 15, light emitting element 16, light receiving element 17, first
Timer 18, second timer 19, selector 20, four T
G21a to 21d, four DAs 22a to 22d, four mixing units 23a to 23d, four headphones 24a
To 24d and a microphone 25.

The CPU 11 is a central processing unit that controls the operation of the entire music training apparatus (hereinafter, abbreviated to the apparatus) while using the work RAM 12 as a work area in accordance with the control program stored in the program ROM 13. is there.

The work RAM 12 is a random access memory used by the CPU 11 as a work area when the control program is executed by the CPU 11. The program ROM 13 is a read-only memory in which a control program executed by the CPU 11 for controlling the entire apparatus is stored in advance.

The music memory 14 stores in advance music performance data for automatic performance of a chorus to be practiced.
FIG. 3 shows the contents of the music performance data. As shown in FIG. 3, the music performance data in the present embodiment has data for each part of soprano, alto, tenor, and bass. Here, the data of each part is collectively called a track, and in the example of FIG. 3, a total of four tracks from 0 to 3 are shown for each part.

At the beginning (address 0) of each track, data indicating a tone to be generated when performing an automatic performance of a model lead music of each part is stored. In the practice of chorus, a piano tone is generally set as tone color data, but a tone using an organ or the like may of course be used.

After the timbre data of each track (address 1), the waiting time from when the operator instructs the start of the automatic performance of the lead performance to when the apparatus actually emits the first sound is stored. . The time data is provided for the sake of convenience so that the chorus standby can be performed after the operator instructs the performance start.

After each track (after address 2), event data and time data are stored as a pair, and the event data indicates the pitch of a musical tone to be generated.
The time data indicates the duration of sounding of the musical tone at that pitch. It should be noted that the event data may indicate a pause in sound generation, and the time data in that case indicates a pause time during which sound generation is paused.

At the end of each track, END data which is event data indicating the end of the music is arranged. The music performance data stored in the music memory 14 described above is appropriately changed to data on the music in accordance with the music to be practiced.

Returning to the description of FIG. SW15 is a group of switches operated by the user of the apparatus, and includes a start SW and a stop SW, which are switches for giving an instruction to the CPU 11 to start / stop automatic performance of lead music of a choral piece to be practiced. In addition, it has a switch for performing various operation controls.

The light emitting element 16 is, for example, a light emitting diode, and is turned on / off according to an instruction from the CPU 11. The light receiving element 17 is, for example, a photodiode or the like, and detects whether light emitted by the light emitting element 16 is received.

The first timer 18 is used for measuring the speed of the command waved by the conductor, and will be described later in detail. The second timer 19 controls the tempo of the automatic performance of the chorus lead music, and changes the stepping speed according to the speed of the conductor shaken by the conductor. Details will be described later.

The selector 20 selects, under the control of the CPU 11, from the TGs 21a to 21d the TG to which the tone data of each part of the lead music of the chorus to be practiced is transmitted.

The TGs 21a to 21d are tone generators which generate and output musical tones based on the music performance data received from the CPU 11 via the selector 20, and may be, for example, synthesizers.

DAs 22a to 22d are DA converters, which convert digital sound data from the TGs 21a to 21d into analog signals and output the digital signals. If the TGs 21a to 21d are capable of outputting analog tone signals, the DAs 22a to 22d are unnecessary.

The mixing units 23a to 23d are connected to the TG 22
The audio signals from the microphone 25 are mixed with the respective outputs a to 22d. Headphones 24
Reference numerals a to 24d are worn by four persons in charge of the respective parts, and emit the respective outputs of the mixing circuits 23a to 23d as audible sounds.

The microphone 25 collects and collects the chorus of the four parts. The microphone 25 is preferably arranged at a position where it is expected that the audience will listen to the chorus in a live performance.

Next, control performed by CPU 11 shown in FIG. 2 will be described. FIG. 4 shows the CPU 11 that is realized by the CPU 11 executing a control program stored in the program ROM 13 immediately after power-on.
It is a flowchart which shows the control processing of the whole music joint practice apparatus by. The control operation by the CPU 11 will be described with reference to FIG.

First, in step S101, an initialization process is performed immediately after the power is turned on, and the register, the work RAM 12, the first timer 1
8. Processing such as initialization of the second timer 19 and the like, setting of a disabled state of the interrupt (interrupt) from the first timer 18 and the second timer 19, storage of the initial set value, and the like are performed.

In steps S102 to S104, switching, tempo setting, and reproduction are performed. Details of each of these processes will be described later. In step S105, other processes, such as a control process of a display unit (not shown) for displaying an operation state of the apparatus, are performed. Since the processing performed in this step is not directly related to the present invention, a detailed description is omitted. After finishing the process in step S105, the process returns to step S102, and each process described below is repeatedly performed.

Next, the switching process in step S102 of FIG. 4 will be described. This process is a process of detecting operation of the SW 15 to the start SW and the stop SW by the user of the present apparatus, and controlling the start / stop of the automatic performance of the chorus to be practiced based on the detection result. is there.

FIG. 5 is a flowchart showing the contents of the switch processing performed by the CPU 11. Hereinafter, the processing contents of the switch processing will be described with reference to FIG. First,
In step S201, it is checked whether or not an operation on the start switch of SW15 has been performed. If an operation has been detected, the process proceeds to step S202, while if no operation has been detected, the process proceeds to step S215.

In step S202, 0 is substituted for a variable n. In step S203, the status flag STF
Substitute 1 for (n). STF (n) is a flag indicating whether or not to perform a reproduction performance of the music performance data stored in the n-th track, and is referred to in a reproduction process described later. Note that when STF (n) is 1, it indicates that the reproduction performance of the music performance data stored in the n-th track is performed.

In step S204, a variable AD used to refer to the data of the n-th track one by one is used.
Substitute 0 for D (n). In step S205, the music performance data stored in the music memory 14 is read. By specifying EV (n, ADD (n)), the n-th
The data stored at the address ADD (n) of the track is read. In this step, ADD
Since the value of (n) is always 0, EV (n, ADD
As the data read in (n)), the tone color data stored at the head of the n-th track is read.

In step S206, the value of the variable n indicating the track of the data to be read from the music performance data stored in the music memory 14 is sent to the selector 20, and
The user selects a TG that is a destination of the musical sound data for each music part from the TGs 21a to 21d.

In step S207, step S205
Is sent to the selector 20.
The transmitted timbre data is transmitted to the TG2 via the selector 20.
It is sent to the TG selected by the processing in step S206 of 1a to 21d.

In step S208, the variable ADD (n)
Is replaced by 1. In step S209, the music performance data stored in the music memory 14 is read. In this step, since the value of ADD (n) is always 1, the data read by EV (n, ADD (n)) is the waiting time data stored next to the tone color data of the n-th track. It is.

In step S210, the waiting time data read in the previous step is substituted for a variable TIMER (n). TIMER (n) is a variable indicating the remaining time of the continuation time of the sound (pause) of the event currently being executed on the n-th track. Here, the waiting time data is substituted. The value of TIMER (n) decreases as time elapses due to the action of an interrupt process activated by the generation of an interrupt from the second timer 19 described later.

In step S211, the value of the variable n is increased by one. In step S212, the value of the variable n is compared with the number of tracks included in the music performance data stored in the music memory 14. If the value of the variable n is larger, the process proceeds to step S213. On the other hand, if not, the process returns to step S203, and the above-described processing is performed on the music performance data of another track.

In step S213, the interrupt prohibition state by the first timer 18 and the second timer 19 is released. Thereafter, the operation of the light emitting element 16 and the light receiving element 17 is started in step S214, the operation of the microphone 25 is started in step S215, the current switch processing is completed, and the processing returns to the control processing shown in the flowchart in FIG.

If it is determined in step S201 that an operation on the start switch of SW15 has not been detected, it is checked in step S216 whether an operation on the stop switch of SW15 has been performed. Proceed to step S217. On the other hand, if no operation is detected, the current switch process is terminated, and the process returns to the control process shown in the flowchart of FIG.

In step S217, 0 is substituted for a variable n. In step S218, the status flag STF
Substituting 0 into (n) indicates that the reproduction performance of the music performance data stored in the n-th track is stopped.

In step S219, the value of the variable n is increased by one. In step S220, the value of the variable n is compared with the number of tracks included in the music performance data stored in the music memory 14, and if the value of the variable n is larger, the process returns to step S217 to perform the above-described processing. Otherwise, the process proceeds to step S221.

In step S 221, a state is set in which interrupts from the first timer 18 and the second timer 19 are prohibited. After that, the operation of the light emitting element 16 and the light receiving element 17 is stopped in step S222, the operation of the microphone 25 is stopped in step S223, the current switch processing is ended, and the process returns to the control processing shown in the flowchart in FIG.

The above processing is the switch processing. next,
The tempo setting process of step S103 in FIG. 4 will be described. In this process, the speed of the conductor waved by the conductor is measured using an interrupt process activated by the occurrence of an interrupt from the first timer 18, and according to the speed, the automatic performance of the chorus lead music is performed. This is a process for changing the tempo.

Regarding the technique used here to control the musical sound played by detecting the conductor's movement in a non-contact manner, the applicant has previously filed a “musical sound control device” This is realized by implementing the invention according to Japanese Unexamined Patent Publication No. 9-281963.

Before describing the details of the tempo setting process, the interrupt process started by the occurrence of an interrupt from the first timer 18 will be described first. This process is a process executed in response to a timer interrupt generated each time the first timer 18 counts a predetermined time, and is basically a process of counting the number of times the interrupt has occurred.

The interval between timer interrupts generated by the first timer 18 needs to be increased to some extent in consideration of the processing time of other processes, but if the interval is too long, the speed of commanding can be measured. Since the adverse effect of lowering the accuracy occurs, the setting is made in consideration of the balance between the two.

FIG. 6 is a flowchart showing the contents of the interrupt processing started by the occurrence of an interrupt from the first timer 18. The processing contents of this processing will be described with reference to FIG. 6. In step S301, the variable TIMER1
Is compared with a preset value (predetermined value),
If the value of TIMER1 is equal to or smaller than the predetermined value, the value of TIMER1 is increased by 1 in step S302, and the current interrupt processing ends. On the other hand, step S
If the result of the determination processing at 301 is that the value of TIMER1 is not less than or equal to the predetermined value, this interrupt processing is terminated without doing anything. The determination processing in step S301 is based on T
This is provided to prevent the value of IMER1 from becoming larger than a predetermined value.

Now, the details of the tempo setting process will be described with reference to the flowchart of FIG. 7 showing the content of the tempo setting process. First, in step S401, it is checked whether the light receiving element 17 has received light from the light emitting element 16. If light reception has been detected, the process proceeds to step S402, while if light reception has not been detected, the current tempo setting process ends, and the process returns to the control process shown in the flowchart of FIG.

In step S402, the detection of light reception of the light from the light emitting element 16 by the light receiving element 17 in the previous step is as follows.
It is checked whether it is the second time or later, and if so, the process proceeds to step S403, and if not, the process proceeds to step S405.

In step S403, the value given to the variable TIMER2 is substituted for the variable TEMP by the interrupt processing started by the above-mentioned interrupt generation from the first timer 18. This value is determined by the light emitted from the light emitting element 16
Is a value related to the period in which the light is blocked.

In step S404, the time interval of the increment of the second timer 19 is controlled in accordance with the value of the variable TEMP. As described above, the second timer 19 is a timer used as a reference for the tempo of the automatic performance of the lead music of the chorus.
By controlling the time interval of this step, the tempo can be increased (when the value of TEMP is small) or decreased (when the value of TEMP is large).
Further, the variable T
Since the value of EMP is limited to a predetermined value or less, the above-mentioned tempo does not become slower than a certain tempo.

In step S405, the variable TIMER1
Is newly substituted with 0. The above processing is the tempo setting processing. Next, the reproduction process will be described. The playback process is
T based on the music data stored in the music memory 14
This is a process for controlling the G21a to 21d via the selector 20 to generate a musical tone, that is, a process for realizing a function corresponding to a kind of sequencer.

First, in step S501, 0 is set to the variable n.
Is assigned. In step S502, the value of the status flag STF (n) described above is compared with 1. STF
If (n) is 1, that is, if it indicates that the reproduction performance is to be performed for the music performance data stored in the n-th track, the process proceeds to step S503. On the other hand, S
If TF (n) is not 1, the process proceeds to step S512.

In step S503, the variable TI
The value of MER (n) is compared with 0. TIMER (n)
Is 0, the process proceeds to step S503. Otherwise, the process proceeds to step S512.

In step S504, the variable AD
Increase the value of D (n) by one. In step S505, the music performance data stored in the music memory 14 is read. By specifying EV (n, ADD (n)), the event data stored in the address ADD (n) of the n-th track is read.

In step S506, it is checked whether or not the event data read in the previous step is END data. If it is not END data, go to step S507
On the other hand, if the data is END data, step S511
Then, go to each.

In step S507, the value of the variable n is sent to the selector 20, and the TG which is the destination of the musical tone data for each music part is selected from the TGs 21a to 21d. In step S508, the event data read in step S505 is sent to the selector 20. The transmitted event data is transmitted to the TG2 via the selector 20.
It is sent to the TG selected by the processing of step S507 among 1a to 21d.

In step S509, the variable ADD (n)
Is increased by one. In step S510, time data corresponding to the event data read in step S505 in the music performance data stored in the music memory 14 is read. In this step, as the data read by EV (n, ADD (n)), the time data stored next to the event data read in step S505 is read. Then, the read time data is substituted for the variable TIMER (n), and the process proceeds to step S512.

If the read event data is END data in the judgment processing in step S506, 0 is substituted for the status flag STF (n) in step S511 and stored in the n-th track. This indicates that the reproduction performance of the music performance data being performed is stopped.

In step S512, the value of the variable n is increased by one. In step S513, the value of the variable n is compared with the number of tracks included in the music performance data stored in the music memory 14. If the value of the variable n is larger, the current reproduction process is terminated, and the process returns to the control process shown in the flowchart of FIG. On the other hand, if not, step S50
2, the above-described processing is performed on the music performance data of another track.

The above processing is the reproduction processing. Next, the second
An interrupt process started by an interrupt from the timer 19 will be described. This process is a process executed in response to a timer interrupt generated every time the second timer 19 counts a certain number, and is basically a process for measuring the remaining time with respect to a predetermined time. By the tempo setting process, the time interval of the advance of the second timer 19 is controlled, and the measurement is performed based on the relative time based on the speed of the conductor shaken by the conductor.

FIG. 9 is a flowchart showing the contents of the interrupt processing started by the occurrence of an interrupt from the second timer 19. The processing content of this processing will be described with reference to FIG.

First, at step S601, 0 is set to the variable n.
Is assigned. In step S602, the value of the status flag STF (n) described above is compared with 1. STF
If (n) is 1, that is, it indicates that the reproduction performance is to be performed for the music performance data stored in the n-th track, the process proceeds to step S603. On the other hand, S
If TF (n) is not 1, the process proceeds to step S604.

In step S603, the variable TI
Decrease the value of MER (n) by one. Step S60
At 4, the value of the variable n is increased by one.

In step S605, the value of the variable n is compared with the number of tracks in the music performance data stored in the music memory 14. If the value of the variable n is larger, the current interrupt processing ends. On the other hand, if not, the process returns to step S602, and the above-described processing is performed on the music performance data of another track.

The above processing is the interrupt processing started when an interrupt from the second timer 19 occurs. A situation in which a joint practice is performed using the music joint practice apparatus shown in FIG. 2 having the above-described configuration will be described by taking a soprano part singer of a choral song as an example.

The singer wears the headphones 24a, listens to the automatic performance of the soprano part of the choral tune emitted from the headphones 24a, and practices the singing of the soprano part. The tempo of the automatic performance depends on the speed of the conductor, so you can practice in a form closer to the actual stage.

Further, from the headphones 24a, together with the automatic performance of the soprano part, the singing voices of all the parts including the own singing, which are collected by the microphone 25, are mixed and emitted. He can practice singing to control his voice volume and pitch, taking into account the chorus balance of all parts.

[0077]

Since the present invention is configured as described in detail above, when a plurality of people gather together to perform a joint practice of music performance such as chorus or ensemble, an efficient joint practice is performed. This has the effect of making it possible to perform

[Brief description of the drawings]

FIG. 1 is a block diagram showing the principle configuration of the present invention.

FIG. 2 is a block diagram showing an overall configuration of a music joint practice device.

FIG. 3 is a diagram showing contents of music performance data.

FIG. 4 is a flowchart showing a control process of the entire music joint practice apparatus.

FIG. 5 is a flowchart of a switch process.

FIG. 6 is a flowchart of an interrupt process started when an interrupt is generated from a first timer.

FIG. 7 is a flowchart of a tempo setting process.

FIG. 8 is a flowchart of a reproduction process.

FIG. 9 is a flowchart of an interrupt process started when an interrupt is generated from a second timer.

[Explanation of symbols]

 1 Lead music means 2 Acquisition means 3a, 3b, 3c, 3d Synthesis means 4a, 4b, 4c, 4d Output means 5a, 5b, 5c, 5d Person in charge of each part

Claims (8)

[Claims] 1. A lead music means for simultaneously outputting a signal indicating lead music of a choral piece in parallel for each part, and collecting a choral voice sung by a person in charge of each part of the choral piece to produce a choral voice signal. A microphone to be converted; a plurality of synthesizing means for individually mixing the choral voice signals of all parts with the lead music signal for each part; and converting the respective outputs of the plurality of mixing means into sound signals and outputting the signals. A music training device comprising: a plurality of earphones; 2. A lead music means for simultaneously outputting a signal indicating lead music of a musical piece in parallel for each part, and an acquiring means for acquiring as a performance signal the contents of a joint performance performed by the person in charge of each part of the musical piece. And a plurality of synthesizing means for individually synthesizing the performance signals of all parts with the lead music signal for each part, and a plurality of output means for respectively outputting the outputs of the plurality of synthesizing means. Music joint practice device. 3. The music joint training apparatus according to claim 1, wherein the lead music means outputs a performance signal in which the lead music is automatically performed by a synthesizer and a sequencer. 4. An output which delays the start of the output by a predetermined time after the instruction is issued by an operator operating the music joint training apparatus to start the output of the signal to the lead music means. The music joint practice device according to any one of claims 1 to 3, further comprising a start delay unit. 5. The music training apparatus according to claim 2, wherein the acquisition unit includes a microphone that collects a performance sound emitted by the performance in charge. 6. The apparatus according to claim 2, wherein the synthesizing unit mixes the performance signal with the lead music signal. 7. The apparatus according to claim 2, wherein the output means includes an earphone. 8. The musical instrument according to claim 1, further comprising tempo changing means for changing the tempo of the lead music indicated by the signal output from said lead music means in accordance with the movement of a human body of an operator operating said music joint training apparatus. The music joint practice device according to claim 1 or 2, wherein