Guitarist Warren Haynes has performed with The Allman Brothers Band roughly 220 times at the Beacon Theatre -- he's so familiar with the Upper West Side fixture that he has a secret room in the back, with what he calls "a little Batcave sort of entrance." ("For all the covert missions," he says, by phone from his Westchester County home.) But the Allmans' upcoming 14 Beacon shows are likely to be their last -- Haynes, 53, and guitarist Derek Trucks recently announced they'd quit at year's end, prompting frontman Gregg Allman to predict the dissolution of the band. In a half-hour interview, the Gov't Mule guitarist discusses the band he first joined for a 20-year reunion tour in 1989.
