He's still on the come up on a national level, but in his hometown of Chicago, Spenzo is huge. His 2013 single "Wife Er" was a massive local hit (and beyond, too—Drake performed a snippet of the track last summer during the Chicago leg of the Drake Vs. Lil Wayne tour), and last year's "I'm So Sorry," featuring Young Thug, has some serious potential of its own. His latest, "Doin' Lines," has Spenzo joined by another one of Chicago's secret weapons: Tree, the originator of soul trap, who's been quietly releasing some of the city's most slept-on projects over the past five years (most recently, last year's @MCTREE_G EP). The track's produced by Bobby Johnson (of "OG Bobby Johnson" fame, naturally). "Doin' Lines" won't appear on Spenzo's upcoming Ahead Of My Time project, but it should tide you over in the meantime; stream or download it below.