Trey Songz is a controlled substance and should be doled out very carefully. His turn on J.R.'s "Best Friend" is predictably on-brand, the perfect chemical balance of sleaze and sincerity, honesty and innuendo, pineapple and vodka. Fresh off of tour with Songz and Chris Brown, the upstart from St. Louis blends his brand of R&B with the window dressings of some of today's rap hits--think Future or Fetty Wap, formatted for content and to fit your screen. As he told XXL when we interviewed him for The Break, J.R. grew up with rappers as his chief influences, citing such hard-edged acts as The Notorious B.I.G., Tupac Shakur and N.W.A. (Of course, he also payed homage to Nelly and his St. Lunatics crew, who helped to pave the way for the modern wave of melody-heavy, rapper-signer hybrids who now dominate certain profitable corners of the radio.) "Best Friend" is the perfect song for those among you who value vocal performance over monogamy.

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