Watch Idina Menzel, Jimmy Fallon, And The Roots Sing “Let It Go” With Classroom Musical Instruments Michael Lee, March 4, 2014March 4, 2014 It looks like Idina Menzel is not letting John Travolta‘s Adele Dazeem flub get in the way of belting out a great performance. Despite a somewhat rushed performance – and slight voice cracking – at the Oscars this past Sunday, Let It Go won the award for Best Song. But…