Ian Sample, the science correspondent for Guardian.co.uk, reports that METALLICA's music had the unexpected effect of calming monkeys when it was played to them as part of a recent study.

In the study, which was published today in the Royal Society journal Biology Letters, 14 cotton-top tamarins were played 30-second blasts of music while the researchers noted any changes in their behavior. 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 METALLICA, the study found.

Read the entire report from Guardian.co.uk.