On Friday, Kid Cudi brought "Pursuit Of Happiness," a Ghostbusters t-shirt, and Ratatat (sans MGMT) to David Letterman. This live take on Man On The Moon's lit third single also comes with a trio of sharp-dressed backup singers, strings, and expressive soloing via Mike Stroud. Letterman knows what's up, rightly commenting there was "a lot going on there," though he ...