Just a month away from their joint tour, The Underachievers and Flatbush Zombies have formed a new supergroup dubbed Clockwork Indigo and released a song as the pairing. “Butterfly Effect” is produced by Flatbush Zombies’ Erick Arc Elliot, and is about as close as we’ve come to a longform “Beast Coast” posse cut. For those looking for hard-hitting rap music that’s both indebted to the golden age and progressive, “Butterfly Effect” should be essential listening. The production is both tripped-out and soulful, and the raps are as strong as ever. You can listen to “Butterfly Effect” above.