Detroit-based Slum Village has gone through many incarnations over the past decade, but emerges fit and trim for their latest “mixtape” collection. Calling it so is odd since every track is by T3 and Elzhi, but no matter-they continue a smart blend of intelligent street slang fused with R&B hooks, jazzy synth lines, and, of course, juiced up and heady bass. Prequel is a fitting title, as nothing on the record progresses beyond what has kept them at the helm of underground headnods. If you‘ve enjoyed thus far, this is more of the same-“classic” as in “old,” not necessarily “necessary.”