Last week's entry in the Gold Rush series featured STS spitting over a flip of Drake's "Marvin's Room," which was transformed into an upbeat party jam. But for the latest entry, "Downhill," the Philly-Atlanta rapper and producer Eric Hahn have embraced the chilly, atmospheric sounds of the xx's "Shelter." The moody track is fittingly complemented by choice footage of STS' recent gig at the Theatre of Living Arts in Philadelphia. You can watch the clip below. Gold Rush drops Feb. 29.