In order to compose a song, composer needs to have many kinds of instruments to preduce his composition. therefore, an assiting tool that can represent instruments to compose a song is necessary. this software was developed to provide that assisting tool. this software was developed using JFugue java API which could represnt music in the form of programming language. the software used the object oriented progamming (OOP) concept and was programmed with java and netbeans IDE 5.5 as the tompiler. this software provides 16 tracks, 127 type of instruments, note setting. it is also can read, write, and save file in MIDI format.