"Frozen" star joins Fallon for classroom version of "Let It Go"

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Jimmy Fallon and The Roots went back to school - again - Monday night.

"The Tonight Show" host and his band pulled out the classroom instruments and joined "Frozen" star Idina Menzel in a remake of "Let It Go," the Oscar-winning song from the Disney film.

Fallon played wooden alphabet blocks, while Menzel manned the triangle for the song. Members of The Roots played kazoos, a small plastic xylophone, a tambourine and other instruments pulled straight from grade school music class for the song.

"Let It Go" won the Academy Award Sunday night for "Best Original Song." Menzel provided the voice of Elsa in the animated hit.

Menzel is the latest star to join the new Tonight Show host for a classroom remake. Others have included Robin Thicke, Carly Rae Jepsen, Mariah Carey and the cast of Sesame Street.

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