Girl Talk is Pittsburgh-based DJ and mash-up artist Gregg Gillis. Not too long ago, Gillis made his bread and butter as a biomedical engineer, relegating his DJing to hobby status. But the buzz on both his wildly inventive productions — slicing and dicing and stitching together bits of oldies, chart hits, indie-rock favorites and hip-hop jams — and his wilder live performances eventually propelled him to make Girl Talk a full-time endeavor. He’s released four albums to date, including 2006’s Night Ripper and last year’s critically acclaimed Feed the Animals. On the side, he’s also one half of the production team Trey Told ’Em (with Frank Musarra of Hearts of Darknesses); together they’ve remixed tracks by Grizzly Bear, Of Montreal, Simian Mobile Disco, Tokyo Police Club and Peter Bjorn and John.