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He has long since given up on the idea of building an audience, from one album to the next, and of playing to bigger and bigger halls. Instead, he has indulged his curiosities and whims, tending to a variety of smaller audiences. It is no longer accurate, really, to call him a rock star. He’s a professional omnivore, a master, for better and worse, of eclecticism. Discusses Costello’s lyrics and tells about a performance he gave earlier this year at a wind-power conference in Dallas.