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Bruce Hornsby has a unique excuse to avoid diaper duty: ”Honey, I`ve got to go on tour with the Dead.”

The Grateful Dead, that is. For two years, keyboardist Hornsby has been a part-time member in the San Francisco band, catching shows when he can. The first Dead tour of the year, however, came just a month after Hornsby`s wife, Kathy, gave birth to twin sons. So is Hornsby just trying to avoid late-night feedings and diaper changes? ”No, no, no,” he says with a laugh. ”The good thing about this tour is that we played Hampton, Va., so I was home

(Williamsburg) for four days.”

Hornsby`s participation in the three-week tour, which ended Tuesday in Detroit, attests to the musical allure of playing with the Dead. ”It`s a great situation; whenever I want to come, the chair`s open,” he says.