The vaults of unreleased J Dilla music are seemingly endless, but most of it is instrumental stuff, beats that never ended up getting used for anything. In a couple of weeks, however, a long-lost vocal album that Dilla recorded way back in 2002, The Diary, is finally going to see the light of day. We’ve already heard one track from it, “The Introduction,” and Dr. Dre premiered another on his Beats 1 show yesterday. Produced by Hi-Tek, “Gangsta Boogie” features Snoop Dogg and Kokane in addition to Dilla himself showing off his skills on the mic, and it boasts a squelchy, vaguely Thundercat-esque bassline. Listen below.