WATCH: Idina Menzel Sings “Let It Go” With Fallon, The Roots

The singer/actress belted out the Oscar-winning song while "The Tonight Show" house band played classroom instruments.

Idina Menzel joined Jimmy Fallon and The Roots to perform "Frozen's" Oscar-winning song "Let It Go" in a segment that aired on "The Tonight Show."

Menzel belted out the tune as Fallon's house band played classroom instruments, just as they have with Mariah Carey, "Sesame Street" characters, Robin Thicke, and Carly Rae Jepsen.

Besides the win, Idina Menzel made other Oscars news when John Travolta mispronounced her name during the telecast.

Menzel wasn't in "The Tonight Show" studio to address the controversy, but Fallon used the mistake for some laughs. 

"He could tell as he was saying it, 'This is not going to come out right at all — I'm gonna say sounds,'" Fallon said after playing the clip twice. 

"When Idina Menzel heard that, she was just like 'let it go, let it go'," Fallon said.

Fallon also joked that Leonardo DiCaprio said Jennifer Lawrence also flubbed a name at the Oscars when she announced the winner for best actor as Matthew McConaughey. 

Watch Idina Menzel's performance above. 

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