On Tuesday Chief Keef dropped Nobody, the latest in a string of full-length projects he’s released since his public breakup with Interscope at the end of October. A day before it came out Keef released the title track, an Auto-Tune-splattered collaboration with Kanye West that’s built on a sample of Willie Hutch’s “Brother’s Gonna Work It Out.” The looped sounds of a lilting guitar and feathery flute should be familiar to anyone who burned Chance the Rapper’s Acid Rap in their brains, as the song “Lost” samples the very same elements from Hutch’s song (Dr. Dre also sampled the tune a couple decades ago). The song is sampled so often that I noticed handfuls of Twitter users say Keef had sampled Chance, so this seems like as good a time as ever to revisit the actual source material, “Brother’s Gonna Work It Out,” which is today’s 12 O’Clock Track. The cinematic soul number closes Hutch’s soundtrack for the 1973 blaxploitation flick The Mack; take a listen to the tune below, and for good measure check out the tracks by Keef and Chance that use a sample from Hutch’s track.