Recently, Computer Assisted Instruction (CAI) class has been experimentally carried out in wide variety of education and training. It is effective for students in class to learn by using motion pictures and real sound. Conventional CAI systems have consisted of text and still images based on contents without a sense of reality. There are a few exceptions, but a special hardware and software for processing the contents are expensive. The purpose of this study is to develop a musical instruments

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... earning system communicated by network between some users. Each user such as teachers and students are connected and collaborate with another users in the musical contents. In this system every user are virtually located in a virtual concert hall and share the same time and same music contents. Performance of the developed learning system is experimentally investigated for twenty subjects as the users in music class. After the users collaborate and practice a predetermined music for playing the virtual keyboard in the class, the audience appreciates and evaluates the playing of the keyboard in the virtual concert hall. Almost the entire subjects are pointed out that the learning system has good performance for playing on the music keyboard. There are some problem about the sound quality and operation of the virtual keyboard in the system. Commercial available MIDI instruments are effective to solve these problems.