I remember a music class at Temple (1974)that listed the 4 groups of musical instruments, and there was alot of argument over whether to even include the Hammaond organ, because it was electronic. Eventually, that became it's own group, but for centurys there were only 4 groups...string, woodwind, brass and percussion. At that time they were using the acoustical properties of air movement as a criteria for sound creation. If you look at it THAT way, when using an electronic instrument....the speaker is actually moving the air - without it - there IS no music. You can debate that one forever. Tecnically - no digital instrument REALLY makes music - it needs the movement of air to be heard, and if it's NOT heard ..... is it music?
..Things that make you go hmmmmmmmmm......?