Over their decades-spanning career, Pere Ubu have changed and grown without losing any of their inventiveness. On 20 Years in a Montana Missile Silo, they reorient their music once again: inspired by the concept of putting people in a dark room with an object or animal and having them describe it based on what they felt, David Thomas had his musicians work on their parts independently, then edited the pieces together. Though these intentionally fractured tracks are much shorter than Lady from Shanghai and Carnival of Souls' epics, unlike Pere Ubu's early-'90s alt-rock flirtations, 20 Years feels less like a compromise and more like a challenge to see just how much wild creativity the band can pack into a short amount of time. "Monkey Bizness," which opens the album with a dose of nightmarish nursery rhyme surf-punk, barely passes the two-minute mark. The brevity of 20 Years' outbursts only adds to their mystique; when Thomas sings "I'm the man you know so well/But which part of me is hard to tell" over chugging boogie-woogie, it distills the album's feeling of stumbling around in the dark, grasping for clues. Similarly, the band's inspired subversions of familiar sounds, whether it's the stalking blues of "Howl" or the stomping punk of "Red Eye Blues," just add to the unease that culminates on the album's more experimental tracks. Pere Ubu remain masters of wasteland soundscapes on songs like "I Can Still See" and "Plan from Frag 9," on which Thomas compares himself to a pencil's ability to leave -- or remove -- a mark over seething electronics, jittery handclaps, and Darryl Boon's swirling clarinet. However, Thomas is 20 Years in a Montana Missile Silo's main attraction, and he uses the album's wailing, clanking, and gurgling instrumentation to complement some of his most expressive vocals. On "Funk 49," he mutters "Yeah I got a bit of soul/I keep it in a cage" with the deadpan delivery of a comedian as synths and guitars lurch at Dutch angles. Later, he's surprisingly tender on the windswept acoustic ballad "The Healer" and "Cold Sweat," where he's both sarcastic and vulnerable as he sings "Thank you/You've been great/And I really mean that" over a sea of synth strings. 20 Years in a Montana Missile Silo's glimpses at life's unknowability are disturbing, affecting, and always fascinating -- and prove that Pere Ubu are as vital as ever in the 2010s.