MANSFIELD -- Supreme cool is an ineffable quality. But you know it when you see it, or hear it, and Steely Dan -- a.k.a. singer-keyboardist Donald Fagen, guitarist Walter Becker, and, this time out, 10 sublime servants of a singular legacy -- had it in spades during a sharply focused two-hour performance Sunday night.
With the exception of a lengthy drum solo -- rock music's equivalent of the leisure suit -- and the band handing over the opening verses of ``Do It Again" to ex-Doobie Brother-cum-Motown revivalist Michael McDonald, who flattened them, this was a flawless evening. Together with lead guitarist Jon Herington , with whom he seamlessly traded licks and leads, Becker was in consummate form, his wry, pungent solos providing perfect punctuation marks for Fagen's acerbic commentary on youthful folly, adult subterfuge, and royal scams.