Twenty years ago, Jon Spencer transitioned from Pussy Galore’s scum-encrusted noise rock to the Blues Explosion’s “Elvis with dynamite up his ass” approach. These sophisticated New Yorkers—including guitarist Judah Bauer and drummer Russell Simins—appropriated white-trash demeanors while playing savage, jagged rockabilly and barbed-wired blues rock. Some thought it corny while others found it to be a brilliant twist on hoary musical tropes. Bottom line: JSBX scorch live. If they draw heavily from their ’90s albums tonight, expect memorable sparks. (Neumos, 925 E Pike St,, 8 pm, $20 adv, 21+)