This paper presents the easy way to compose musical composition for non-musicians. Firstly, we developed a chord-based music composition program, and then incorporated it into the auto-accompaniment program. Namely, the only way we have to do is to select a chord and put it to special program which called "the chord-based music composition program" and then the composition program creates the rest of the chords automatically. Consequently, non-musicians overwrite their own melodies in accordance with created chords. Finally, they can perform their own music with the sound of master-keyboard and other sound sources by using the auto-accompaniment program. Keywords: Chord progress, Chord composition, auto- accompaniment, harmonic chord.
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