PERPETUAL GROOVE Perpetual Groove has plenty of the hallmarks of a classic jam band - an exhaustive touring schedule, fans who follow them to a different city every night and meandering, genre-melding grooves. Hailing from Athens, Ga., they're known for putting on a fine light show in conjunction with their blend of original songs and wide-ranging selection of covers, which includes everything from Talking Heads to Rage Against the Machine. Matt McDonald has returned to the band after four years, reuniting the original lineup. $15-$30. Neighborhood Theatre.