50 Cent might want to hold on to his dollars. The rapper and Dr. Dre are being sued by a music producer, TMZ is reporting. Brandon “Dirty Bird” Parrott wants Fiddy (born Curtis Jackson III) and Dre to fork over cash from their hit single, “P.I.M.P.” Parrott was told in 2003 that Dre’s label, Aftermath used his track “BAMBA” in the hit song, featuring Snoop Dogg and appearing on Fiddy’s debut album, “Get Rich or Die Tryin’.” The only problem, according to a producer, is that they forgot to tell him it was Parrot’s track before the final edits so he wasn’t credited. Aftermath Records later settled with Parrott for an…