After more than 30 years, the Fleshtones still seem possessed by the twin spirits of Dionysus and rock and roll. Peter Zaremba and Keith Streng, the two N.Y.C. guys who founded the band in 1976, plan to stay away from any sort of exorcism for many more years. "It is more fun than you can imagine," says Zaremba, 53. "And totally necessary. Since we've always been fairly preposterous, the age thing doesn't make much difference." The Fleshtones played '60s-style garage rock right when punk and disco were dividing music fans. A book about the group, Sweat: The Story of the Fleshtones, America's Garage Band, was published last year. Zaremba says writer Joe Bonomo got it mostly right, but he's not so sure sweat is the one word that best describes the band's bacchanalian live shows. "I use the word spiritual," he says. "It's somewhere in between. It's a form of release and renewal. I think that's rock's prime function."