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Zac Efron and Danny Devito sing with children's choir

Passing through New York City on the promo trail for their new film, Zac Efron and Danny Devito decided to flex their vocal cords.

They stopped by the New York Public Library to sing with the PS 22 Chorus, a choir of children who have become known on YouTube for their covers of popular songs.

With both stars and children sporting moustaches from The Lorax, the song of choice this time was Eric Clapton's "Let It Grow".