Donald Glover aka Childish Gambino is a name that you should be hearing more and more of in 2012 (especially seeing as the awesome comedy that he stars in, Community, is currently on hiatus!).
Performing live on Letterman, Heartbeat is one of the leading lights on his current album, Camp. Great to see him perform this, as he gears up for two London shows in January (on the 25th and 26th) the first of which sold out (I have a spare ticket btw if anyone wants to be super nice to me) within 10 minutes! That just gives you an idea towards his burgeoning reputation.