Well known investor (and past The Next Web Conference speaker) Chris Sacca, going above and beyond his duties as a startup judge in order to test out a cool new music creation startup called uJam here at TechCrunch Disrupt in NYC, just sang in front of the entire Disrupt crowd (just to clarify, Mr. Sacca is not an investor in uJam). Watch the video below to not only check out Sacca’s singing voice (and cowboy shirt) but to see how uJam can turn any tune in your head into a song with accompaniment: