TWILIGHT star ROBERT PATTINSON has turned down the chance to contribute to the soundtrack for the vampire movie's forthcoming sequel - because he wants to keep music as a back up career.The British actor is a talented composer, pianist and guitarist and wrote two songs for the original movie, helping the soundtrack top the U.S. album charts upon its release last year (08). But Pattinson insists he's now taking a backseat to rockers Paramore, who are penning the title track to the movie's sequel, New Moon - because pursuing music professionally was never his intention. He tells America's OK! magazine, "I really didn't want it to look like I was trying to cash in. Music is my back up plan."