Childish Gambino 'Heartbeat' on 'Letterman'

Comedian/rapper performs new single

Childish Gambino – a.k.a. comedian Donald Glover, a.k.a. Troy from Community – turned up on last night's episode of Late Show with David Letterman to perform "Heartbeat," the emotional centerpiece of his debut album, Camp. Though Glover had to bite his tongue on some of the explicit lyrics, the heartbreak and confusion in the song comes through in this spirited performance.

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