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In the study, cotton-top tamarins grew calmer after they heard music compositions based on their own calm, friendly calls, and became more agitated when exposed to music that contained elements of their own threatening or fearful calls.
“Basically I took those elements and patterned them the way we do normally with music,” he says. “You repeat them, take them up a [musical] third — you know, using the same kind of compositional techniques we use in human music.”
He played the compositions on his cello and then electronically boosted them up three octaves, to a pitch that matched the monkeys’ voices. Monkeys don’t respond at all to music written for humans, but they did respond when they heard this composition.
Snowden says people may not be calmed by this relatively fast tempo of one of the pieces, but the monkeys in his lab certainly were.
Music Written For Monkeys Strikes A Chord : NPR
click through for happy monkey tunes.