R+B star Usher is determined to silence critics who savaged his performance in the movie IN THE MIX when he takes on the role of BILLY FLYNN in the Broadway production of Chicago. Usher, real name Usher Raymond, had his first starring role last year (05) in the ill-fated mob movie. The film received harsh reviews and failed to generate ticket sales at the box office. He says, "You learn how hard it is to find the right part. They're not a dime a dozen, they're tough, man. "But I'm also doing it (Chicago) because it's a challenge, a challenge to myself." The Grammy Award winner wants to tackle all aspects of showbusiness and claims the New York City stage is the next logical step. He adds, "I want to do everything - because I can!"