If memory serves, I saw Drivin’ ‘n’ Cryin’ open for Jason & the Scorchers many years ago; tonight, as Ignatius J. Reilly (a retrograde Southerner of a different stripe) would say, Dame Fortuna’s wheel has turned, and the billing is reversed. The prospect of a once-great band like the Scorchers bitter-ending it, accepting warmup status in front of a band that used to open for them—and never even got big—would be pathetic, except for two things: First, as Nashville’s longest-lived country punks demonstrated at the Bayou last time they came through, they can still upstage most any headliner. And second (and more unlikely), the Scorchers’ new album, Clear Impetuous Morning, is vital in a way the band’s ’95 comeback disc, A Blazing Grace, wasn’t. Grace rocked hard but seemed to be trying to hit marks the band had covered more than adequately in the ’80s; Clear is loose and funny (the album’s finish is downright Pythonish), and almost totally free of the self-mythologizing that made Jason seem charmingly naive on Lost and Found but tediously delusional later on. If they get enough stage time to warm up, you might even get hit by spinning-guitarist Warner E. Hodges’ sweat. Also with the Health & Happiness Show at 8 p.m. at the Bayou, 3135 K St. NW. $15. (202) 333-2897. (James Lochart)