Hella, the gamechanging early-2000s math-rock outfit, eventually morphed from a duo to a quintet and released one intriguing LP in their new format in 2007 before petering out. Core members Spencer Seim and Zach Hill (who moved on to the shadowy art-rap outfit Death Grips) haven’t played a single show since that era, but they did return to their original duo configuration long enough to produce Tripper, their final and arguably strongest LP to date. Despite a few years off, they fully reclaimed the feverishly hooky post-prog songwriting smarts captured on early releases Hold Your Horse Is and The Devil Isn’t Red while upping the aggression of their delivery to white-hot levels, yielding new-school Hella classics such as “Headless” and “Yubacore.” If Tripper turns out to be the band’s swan song, it will be a fitting capstone to Seim and Hill’s singular chemistry, unrivaled by any other 21st-century band in their lane.