*nod*
Sounds are music.. even the sound of a hammer hitting a nail, or
the fingers hitting the computer keyboard, they're all music.

Cavemen music ah, I dunno. It could be possible that they had
mostly percussion music, such as hitting on simple drums [since
they had animal hide] or hitting two sticks together. I've never
read about cavemen music before... hmm might be an interesting
read. 