After a breath-taking 54-song year—20 on Get Happy!!, 20 on Taking Liberties, and a modest 14 on Trust—1981 was barely six weeks old and Elvis Costello was gone again. The Silver Train bus that carried E.C. and the Attractions and their old Chinas (whatever the hell that meant) Squeeze as they crawled across the U.S.A. is now schlepping Steve and Eydie or the Rossington Collins Band. Mr. Costello leaves in his speedy wake thousands of satisfied customers, a new album getting “very hot add-on action” (a highly technical trade term which means it’s getting played a lot on radio radio), and several reasonable questions. The questions, alas, will have to resolve themselves over time because E.C. doesn’t talk to the press.