VIDEO: Idina Menzel, Jimmy Fallon and The Roots sing "Let It Go" from "Frozen" with classroom instruments

If last night’s straightforward Oscar performance of “Let It Go” by Idina Menzel wasn’t enough to satisfy “Frozen” fans, tonight she joined Jimmy Fallon and The Roots on “The Tonight Show” to create the most unusual version of this song to date – with classroom instruments. And hilarious results.