There’s no shortage of songs about weed in rap, but, in the case if drug-related music, it’s always more intriguing when content matches inspiration. So, a bit of forewarning: “Platinum OG” is some seriously languid, lose-yourself-in-the-couch-and-iTunes-visualizer music. The production, built around pitched down vocals and soupy bass, feels almost chopped and screwed in tempo. The result mimics the emcees’ the potential side effects of pot, as Highlife, Kami de Chukwu, Joey Purp wax poetic about their drug of choice.