I'd hadn't heard of a Mash-up Artist until I recently watched a documentary called Rip, a remix manifesto. Greg Gillis, better known as Girl Talk, is one such artist. He's not a DJ, and he'll be the first to tell you that. He uses only a laptop and music editing software to "mash up" iconic pop and rock songs (sometimes over 20 different songs in one track) and lays them over a heavy hip-hop beat. Like most DJs, one of his great skills is slowly working the crowd into a frenzy through his set. I don't think I've been at a show quite like this. From the unique talent of the artist, to the absolute unity that this packed house of strangers was displaying. Girl Talk, Google him.