Gangrene is the duo of producer/rappers Oh No and Alchemist, and between the two of them, they're responsible for a fairly absurd number of rock-hard bangers. In 2010, they released Gutter Water, a pretty underrated album of dense and fractured boom-bap, and they'll follow it up with a new one called Vodka & Ayahuasca. Below, check out the title track, ...