Last night Gorillaz were the musical guest on _SNL_ , marking Damon Albarn's debut on the show. Their new UK #1 album _The Mountain_ just came out a couple of weeks ago, but they only played one song from it: "The Moon Cave," during which they were joined by Asha Puthli, Black Thought, and Anoushka Shankar. They also played their 25-year-old debut single "Clint Eastwood" with Del The Funky…