Gnarls Barkley is about as unlikely a pairing as possible. Mastermind producer Danger Mouse teamed up with rapper/singer Cee Lo Green for what seemed like a creative flight of fancy, but suddenly became tremendously successful. 2006 debut St. Elsewhere spawned a massive hit in “Crazy,” and 2008 follow-up The Odd Couple managed to somehow surpass the original. Promises of a third album this year have yet to be fulfilled, but fans can only hope this side project bears more fruit.