Credit: Audrey Gatewood

The music of Baltimoreโ€™s Horse Lords has always borne, at heart, a radical trigonometry. Formed in the early 2010s, the quartetโ€“drummer Sam Haberman, guitarist Owen Gardner, saxophone player/percussionist Andrew Bernstein and bassist/electronics guy Max Eilbacherโ€“dependably tussle genres into cinched shapes.

Companionably raucous and rousing, the bandโ€™s self-titled 2012 LP set the tone for what was to follow: interlocking, needle-nosed melodies that quote Eastern and African harmonics and rhythms; post-rock as math rock; precision; from-concentrate felicity; a sojournerโ€™s intrepidness. By 2014โ€™s โ€œHidden Cities,โ€ shorter compositions had become the norm, while 2016โ€™s hallucinatory โ€œInterventionsโ€ added looped samples and upped the electronic ante. Occasional โ€œmixtapesโ€ expanded the sonic and rhythmic palette further, with the back half of โ€œMixtape IV,โ€ from 2017, folding or sliding in stretches of tag-teamed spoken-word poetry.

โ€œThe Common Task,โ€ out this week on Northern Spy Records, keeps one foot rooted in the bandโ€™s past while planting another firmly in its future. Discordant and threshing, โ€œAgainst Gravityโ€ is among the more forcefully aggressive tunes Horse Lords have committed to tapeโ€“a hard, rapid bop that makes room for synchronized convulsions and hootenanny-ready sax flurries.

Slinky, syncopated and infinitely intricate, โ€œPeopleโ€™s Parkโ€ recalls the winsome, virtuosic artificiality of Tortoise and Steely Dan, its percussive groove splintering purposefully, in expressed denial of a traditional conclusion.

For โ€œFanfare for Effective Freedom,โ€ Horse Lords go all Horse Lords: head rushes of knotted, atonal guitars, kaleidoscopic synthesizers sounding like digitized chimes, spackled beats juicing the tempos; this is nothing less than gourmet roughage for the ears, two or three coursesโ€™ worth. Sometimes, the past is where itโ€™s at.

Duncan Moore, late of Needle Gun, contributes searing accordion drones to โ€œThe Radiant City,โ€ andโ€“corsucating electronics and filtering effects asideโ€“itโ€™s unclear where, exactly, his input ends and his hostsโ€™ performance begins. Thatโ€™s fine; the future, after all, is inherently mysterious.

Speaking of which, โ€œIntegral Accidentโ€ is both the centerpiece of โ€œThe Common Taskโ€ and its biggest swing. For 19 fraught minutes, the band exercises a new sort of disorientation. Field-recorded crowd chatter and sonic detritus implies unbound space. Guest singer Bonnie Landerโ€™s voice burns at an almost impossibly high frequency, and other guestsโ€“accordionist Leo Svirsky (Couch Slut, Hume), violinist Ledah Finck and bassoonist James Young (Waco Mammoth)โ€“quietly let themselves into the mix. Serrated effects scrape at or strafe the silence; the instruments seem intent at taking one anotherโ€™s temperature.

Just when the listener has acclimated to a state of perpetual warming up, a song coheres, somewhere out in the ether, with Gardnerโ€™s relentless guitar snarl taking point, eventually accruing a patina of handclaps and a suffocating sound mosaic. Mesmerizingly, โ€œIntegral Accidentโ€ never quite stops evolving. Is this fusion gospel? Is this chamber funk? Was all that a prelude to noise? To these ears, the song in its final, warped movement suggests a hot-air balloon slowly slipping the bonds of earth.

Horse Lords will play a record release show for โ€œThe Common Taskโ€ this Thursday at the Ottobar with Rest opening. Visit theottobar.com for tickets and more information.