Comment by ZeroGravitas

There's a crazy theory that human burial, as well as singing and dancing, are an evolutionary defense against large predators.

http://www.meltingasphalt.com/music-in-human-evolution/

That link is a blog length summary of a book, but the ultra-short version is: if local predators get a taste for human flesh from a corpse, they'll come after the living and humans singing and dancing in unision can give the appearance of one large animal to scare off predators.