Billboard's Top Producers of 2013 -- 3. The Smeezingtons

Each member of the Smeezingtons -- the trio of Bruno Mars, Philip Lawrence and Ari Levine -- adds his own special sauce: Lawrence is a melody and lyrics maestro, Levine has recording-engineer smarts, and Mars is, well, Mars, touching everything Smeez-related with his kinetic virtuosity. "Nine times out of 10, Bruno will be on the piano, singing something," Levine says. "I'll have a beat going, and Philip will be figuring out lyrics and melody. Whatever sparks something, we just try not to mess it up."