I've been about the possible natural function of music in our evolution. I haven't found any information on the internet. Maybe you guys can enlighten me.
I don't know about internet sources but there are a number of books out about human evolution and creativity. You might try Origins of Genius : Darwinian Perspectives on Creativity by Dean Simonton, see if it has anything to say on music specifically.
http://www.cbc.ca/radio2/features/theNe ... sode1.html (http://www.cbc.ca/radio2/features/theNerve/episode1.html)