Jimmy Fallon & Idina Menzel sing Let It Go, from Frozen Movie [VIDEO]

You can always count on Jimmy Fallon to have his thumb on the pulse of what's trendy. His behind-the-scenes collaborations with some of today's most popular artists are absolutely amazing and so funny. This time he partners with singer Idina Menzel, the vocalist on Let it Go from the Frozen movie, along with his house-band, The Roots. Watch!