Barrytown, Dublin, has something to sing about. The Commitments are spreading the gospel of the soul. Ably managed by Jimmy Rabbitte, brilliantly coached by Joey ''The Lips'' Fagan, their twin assault on Motown and Barrytown takes them by leaps and bounds from the parish hall to the steps of the studio door. But can The Commitments live up to their name?The bestselling book behind the long-running West End stage show. ''Unstoppable fun. A big-hearted, big-night out'' The Times