The Miami-based, 26-year-old Rico Love is quietly becoming one of the industry's most sought-after R&B and pop arrangers and songwriters. Starting out in his early 20s as a rapper in Atlanta, he got his real boost when, as a performer, Usher signed him to his J Records imprint. And while working on his debut album, Rico penned a little tune for his mentor as an experiment. That song was Usher's "Throwback," one of the standout tunes on the singer's 2004 album Confessions.After some time in A