“Biologists argue that the purpose of the orgasm and the accompanying oxytocin is to create an emotional bond between two people so they’ll stay together. Well, it turns out there’s evidence that when people listen to music together or sing together, oxytocin is released then, too. So music forms a social bond in the same way orgasms may, which benefits us as a species.”
Daniel J. Levitin, author of The World in Six Songs: How the Musical Brain Created Human Nature