“I started my career with all these furious ideas, and people somehow feel it’s a betrayal if you don’t represent that all the time. But life is more complicated than that.” ‘I WAS ASKED TO WRITE AN AUTOBIOGRAPHY WHEN I WAS 24,” says Elvis Costello, 61, on the day he receives his first hard-bound copy of his revelatory, evocatively crafted, highly entertaining new memoir, Unfaithful Music & Disappearing Ink. “I said, ‘Could I just live some life?’” ¶ Back then, Costello (born Declan MacManus), the son of a big-band vocalist, blew through rock & roll like a bespectacled tornado, fusing punk, American-roots music and slashing, literary candour on 1977’s My Aim Is True and 1978’s This Year’s Model, the latter with his feral combo the Attractions. ¶ Early on, he…