Mixtape: Ty Dolla $ign, Beach House 2 (2013)

The test of any hip-hop super-producer's full potential may be in how well they can adopt their sound to R&B. Where Mustard's most frequent point of comparison, Lil Jon, stayed in the hip-hop lane for years before Usher blew the "crunk & B" door open, DJ Mustard has long kept singers Ty Dolla $ign and Tee Flii in his inner circle of frequent collaborators. But "Paranoid," the breakout hit from both Mustard's Ketchup tape and Ty's Beach House 2 tape, may be the song that truly mints ratchet & B as a commercial force, providing the template for Mustard to score singles for stars like Trey Songz and Jennifer Lopez. —Al Shipley