In the study, 14 cotton-top tamarins were played 30-second blasts of music while the researchers noted any changes in their behaviour. The animals were played Samuel Barber’s Adagio for Strings and a soft piano piece from The Fragile by rock band Nine Inch Nails, followed by Metallica’s Of Wolf and Man and an excerpt from The Grudge by rock band Tool.

They then heard the specially composed monkey music.

The only human music that elicited any response was the heavy metal band Metallica, whose music had the unexpected effect of calming the monkeys.

When your music calms monkeys instead of exiting them, you know your badass band has failed…

But what if the monkeys didn’t react at all on your music? Maybe Tool and NIN also are not as tough as we all thought.

Via Blabbermouth