Paul McCartney says writing the music for the ballet "Ocean's Kingdom" posed a new challenge for him. He explains that for the project he was "writing music that meant something expressively rather than just writing a song."  The former Beatle adds that he found it exciting to try to "write something that expressed an emotion -- so you have fear, love, anger, sadness to play with."  The London Classical Orchestra, conducted by John Wilson, recorded McCartney's "Ocean's Kingdom" score, which  in stores now.  The album is Paul's first release with Decca Records.  Nearly 50 years ago the rocker unsuccessfully attempted to launch his career with the label.  The Beatles auditioned for Decca in 1962 and were famously rejected, with executives proclaiming guitar groups were "on their way out" and The Beatles had "no future in showbusiness."