Keith Sweat. Soundtrack: Der Diamanten-Cop. Keith Sweat is a Harlem-born R&B singer/songwriter who released his debut album, 'Make It Last Forever', at the end of 1987. The album sold over three million copies, spawning the hits "I Want Her" (#1 R&B, #5 pop), "Something Just Ain't Right" (#3 R&B), "Make It Last Forever" (#2 R&B), and "Don't Stop Your Love" (#9 R&B). It was followed in June 1990 by 'I'll...