'Sour Soul' is the collaborative album from Toronto jazz / hip-hop band BadBadNotGood and Staten Island rap champ Ghostface Killah.åÊInspired by 1960s and 70s music - taking inspiration from the recording techniques and production of that era, and eschewing sampling in favour of live instrumentation, BadBadNotGood with producer Frank Dukes have created a dramatic, cinematic musical staging for Ghostface's vivid storytelling. 'Sour Soul' also features guest spots from MF Doom, Elzhi (Slum Village / J Dilla), Danny Brown and prodigal new rapper Tree (Project mayhem).