Anchored by a somber weight and deep emotional pain impacting the connective tissue binding Mastodon over the decades, Marrow Deep signals a new era for the Atlanta heavyweights. Ninth album, and first since 2021’s bloated and occasionally brilliant double opus, Hushed and Grim arrives on the back of turbulent and traumatic times. Enigmatic founding member, uber-talented axeman/vocalist, and all-round wild man Brent Hinds parted ways in tense circumstances in March twenty-twenty-five, before tragically passing away in a motorcycle accident in August of the same year. The tragedy surrounding Hinds’ premature death hangs heavily over Marrow Deep’s conception. The remaining core trio of bassist/vocalist Troy Sanders, drummer/vocalist Brann Dailor, and guitarist Bill Kelliher composed the album, fleshing out the material with fresh members, guitarist Nick Johnston and keyboardist/synth player João Nogueira. Marrow Deep exorcises tense emotional grief, and like its predecessor, pulls on the heartstrings.
Listeners who tapped out following Crack the Skye will find little here to bring them back into the fold. Following the exhaustive length of Hushed and Grim, cut down to size, Marrow Deep still sports a hefty 65-minute runtime. Peppering their progressive metal and sludge rock core with heady psych and stoner influences, alongside mellower rock and prog fare, Marrow Deep is also frequently direct and punchy. “Your Ghost Again” signals a fitting tribute to their fallen brother, anchored by urgent, driving verses, blossoming into haunting melodies, playful prog and a crushing climax. Fellow singles also fare well, such as the keyboard freakout and effective, minimalist cameo from Josh Homme (Queens of the Stone Age) on “Snakes for Dinner,” or the impressively raw, gut-wrenching Sanders vocal performance on the doomy ” Ruins,” inspired by the personal events of Hurricane Helene.
Dailor’s smooth, though divisive, melodic vocals, alongside the deceptively dynamic bellows and rough vox of Sanders, sound confident, impassioned, and familiar, while the increased integration of keys and synths enlivens the Mastodon formula, adding texture and swirling psychedelia into the sludge rock and progressive metal populating infectious, riff-driven songcraft. Heavier and more energetic than its predecessor Marrow Deep often hits with impact. Featuring a bending, genuinely heavy swagger, opener “Barbarians Blood” eventually unleashes a turbo-charged, thrashy, punk-metal groove that goes hard. Equally potent, “Poisonous Weapons” demonstrates Mastodon can still crush and destroy through dense, riffy sludge with a bitter edge. Upping the aggressive ante, Nate Newton (Converge/Cave In) and Randy Blythe (Lamb of God) lend their vocal talents to the fiery blast of “A Vampire’s Demeanor.” Elsewhere, the legendary Geezer Butler (Black Sabbath) supplies signature, tasty bass licks on the intro to the trippy, psych-leaning odyssey of “The Vanishing,” while Clutch’s Neil Fallon showcases his gruff preaching on jam-infested finale, ‘The Three Fates.” Gears shift on “Golden Spires,” sweetly balancing the album’s melodic sways and heavier surges through towering riffs and striking dynamics.
Loaded with technical and progressive flair listeners have come to expect, performances are super tight. Johnston fills the Hinds void admirably, without simply replicating his admired predecessor. A hugely competent shredder, Johnston puts his own stamp on Marrow Deep, getting a particular opportunity to exhibit his classy soloing on Marrow Deep’s more exploratory, psych and stoner heavy tunes (“The Vanishing,” “Moth and Bone,” and monolithic closer “The Three Fates”). Dailor’s drumming is as intricate and creative as ever, without overplaying his hand, and the Dailor/Sanders vocal combo sounds confident and assured. Unfortunately, Marrow Deep is saddled with a crunchy but overly clean production and compressed mastering job sapping some of the album’s sonic power. Concerning self-editing issues also surface, and while most the material lands, there are occasional lulls and plods suggesting some shrewder editing may have been required.
For all of Marrow Deep’s strengths and fresh designs, the absence of Hinds is strongly felt. Whether through his songwriting contributions or unique guitar style, which cleverly incorporated outside influences, such as bluegrass and southern rock twang, into Mastodon’s progressive sludge formula. Meanwhile, his hugely expressive, soulful soloing and unmistakable vocals feel odd to be missing; moments occur where you half expect a Hinds vocal to pop up. Gripes aside, Marrow Deep is a better album than expected considering the massive hole left by Hinds’. Credit to the remaining members and new blood for forging ahead with optimism, crafting an entertaining opus. Time will tell where Marrow Deep fits in the greater Mastodon canon. As it stands, Marrow Deep marks a rejuvenated, cathartic, nerve-poking transitional turn from Mastodon.
Rating: 3.5/5.0
DR: N/A | Format Reviewed: Lousy Stream
Label: Lorna Vista Recordings
Websites: mastodonrocks.com | Bandcamp
Releases Worldwide: August 28th, 2026
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