From “Music Written For Monkeys Strikes A Chord,” by Richard Harris, Morning Edition (9.2.09):
David Teie has been developing a theory to explain why music plays on human emotions. His theory is that music relates to the most primitive sounds we make and respond to, like laughter, heartbeats, or a mother's cooing.
Fearful monkey music:
Happy monkey music:
He says, "the paradox is that I distinctly remember thinking once that when they figure out why Puccini makes me cry, I hope I die the day before the news gets out. But the great news about this exploration into music is it's actually more magical and wonderful once you realize how it works."
See also: Music for Cats