In a dream jam session, Metallica teamed up with The Roots and Jimmy Fallon for a rendition of "Enter Sandman" in “The Tonight Show’s” music room on Wednesday. The talk show host and Metallica swapped ...

Backstage before the show, Jimmy, Mariah Carey, and The Roots grabbed some instruments you'd find in an elementary school classroom and stopped by the Late Night "Music Room" to sing Mariah's holiday ...