Revealed as a "secret" Green Day side project, Foxboro Hot Tubs add a bit of extra skronk, meshing power-pop and rockabilly into a series of crunchy, radio-ready anthems. While an underlying sense of Green Day song structure remains intact, the band isn't so much a punk paean as a sacrifice to the garage gods. Billie Joe Armstrong's snotty rasp is present, but for Foxboro, he tempers it with a seedy swagger, barking in time to the heady crunch of tunes like "Mother Mary." The band plays at the intimate Roxy tonight; best to line up really early, as tickets are only available at the door.