Jimmy Fallon, Idina Menzel Perform “Let it Go” With Classroom Instruments [VIDEO]

Jimmy Fallon continues to make comedy gold night after night with "The Tonight Show"!  Last night, he had a musical concert of sorts with his house band The Roots (from Philadelphia, like yours truly), and "Frozen" singer Idina Menzel.  Like they did with Robin Thicke and "Blurred Lines" over the summer, they performed her massive song "Let it Go" using only classroom-style instruments!