Professor Steven Mither in "The Singing Neanderthals" argues very convincingly that communal music and singing pre-date Homo Sapiens never mind pubs!
He describes music as a form of holistic communication which occurs in primates, was developed by Neanderthals and similar hominids and is still a vital part of both culture and individual psychology in our species.
Anyone who has been around people from other parts of the world will have had that wonderful feeling of being able to play music along with people whose language you do not speak a word of.
Many modern psychological studies speak of the way in which music and song is hard wired into our brains- "Your Brain on Music", for example.
I think it started many thousands of years before anything close to a modern human started wondering what was over the hill to the north of a little valley in Kenya.
Cheers
Dave