With debut album Camp less than two weeks away, New York's Hot 97 took the liberty of previewing some more of the highly anticipated Childish Gambino material with the premiere of "Heartbeat" on Saturday. While it has the mounting aggression of "Bonfire," he ultimately balks when presented with the opportunity to really go off on his lady in question, giving way to what is a danceable, slightly romantic chorus on top of a thumping electric bass, which is very different from what we've heard from him thus far. Still, the rhymes about unrequited love and female-related paranoia remain. "We rockin for the nerds right now!" DJ Funkmaster Flex interjects. But lest you think Donald Glover really is just a comedy nerd with a rap habit, he brought his current single to Late Night with Jimmy Fallon on Friday. The elaborate lighting, fierce violinist and Glover's winter beanie all make for an interesting visual, but it's his expressive delivery—exaggerated facial expressions and supremely flexible eyebrows—that make you want to watch him perform instead of just listen. Luckily he left the blood at home.