Monkeys subjected to a range of human music ignored Bach, Nine Inch Nails, and jazz, but found Metallica soothing, the Daily Telegraph reports. The experiment on a group of cottontop tamarins, carried out by a psychologist and a cellist, found that while the monkeys showed no response to human music, Metallica's “Of Wolf and Man” excepted, they had strong emotional reactions to compositions based on the calls of their own species.
"The most interesting thing that has come out of this study is some suggestions for animal care,” one expert told Wired. “It’s very common for people to play music for animals that are in captivity, because they figure that they’ll be interested in it or enjoy it." That may not be the case. They plan to test their theory on other animals.