“Marrow Deep” is the ninth studio album by American band Mastodon, released on August 28, 2026 via Loma Vista Recordings. It is the band’s first album since “Hushed and Grim” (2021), and at the same time their first studio work without co-founder and guitarist Brent Hinds. The official digital editions contain 12 tracks with a total running time of approximately 65 minutes.

The title “Marrow Deep” — “deep into the bone marrow” — aptly conveys the album’s central idea: Mastodon explore grief, memory, loss, and the ability to move forward with life after personal tragedy. The band themselves describe the album as a work that transforms profound grief into music about resilience and solidarity.

An Album of a New Era for Mastodon

In the five years since “Hushed and Grim“, Mastodon’s lives have undergone extraordinarily serious changes. The most significant was the loss of Brent Hinds, who left the band in 2025 and later died in a car accident.

Therefore, “Marrow Deep” is impossible to listen to completely separately from this story. At the same time, Mastodon do not turn the album into a memorial. Reviews repeatedly emphasize that the band uses loss as a starting point for a new chapter rather than as a reason to stop.

Guitarist Nick Johnston and keyboardist João Nogueira joined the core lineup. Johnston does not attempt to literally imitate Hinds, instead bringing his own technique and melodic sensibility; Nogueira, in turn, adds a new layer of progressive and atmospheric sound.

This is one of the key characteristics of Marrow Deep: Mastodon are not looking for a “new Brent Hinds” — they are building a new version of the band itself.

How the Album Was Created

The album was produced by Kurt Ballou of Converge, which was an important choice for the record. His involvement helped emphasize Mastodon’s heavy, aggressive side while also leaving room for experimentation.

Interestingly, some of the material has a very long history. For example, Bill Kelliher came up with the main riff for “In the Ruins” while touring in support of Leviathan in 2004. The song remained unused for many years until Troy Sanders found the right vocal and emotional idea for it.

Thus, the album combines the new era of Mastodon with fragments of their nearly 25-year musical past.

Tracks Overview

“Barbarians Blood”

The opening track immediately demonstrates that Mastodon have returned to a heavier and more aggressive sound.

The song begins with a powerful drum part from Brann Dailor, followed by a massive riff. It contains practically everything fans have come to love about the band: sludge, progressive transitions, a psychedelic middle section, and sharp changes in dynamics.

Metal Hammer calls the track one of the most convincing signs of Mastodon’s return to the heavier side of their music. (Louder)

“Poisonous Weapons”

An even more straightforward metal track. The dense guitars of Troy Sanders and Bill Kelliher are combined with Dailor’s more melodic vocals.

It is one of the songs that recalls early Mastodon, but it is not simply a retro exercise. Atmospheric transitions appear between the heavy riffs, bringing the band back toward a progressive structure.

“Your Ghost Again”

The emotional center of the album.

The song is directly connected to Brent Hinds and the feeling of his presence after his death. But instead of creating a traditional rock ballad, Mastodon have crafted a complex, restless composition in which the music seems to be constantly trying to pull itself back together.

The combination of vocals from Brann Dailor and Troy Sanders, progressive transitions, and guitars by Nick Johnston and Bill Kelliher creates the feeling of a conversation with someone who is no longer there. This is why the song feels not simply like a tribute, but as a musical portrait of the complicated process of dealing with loss.

“Snakes for Dinner” feat. Josh Homme

One of the most obvious singles for Mastodon fans.

The song features Josh Homme of Queens of the Stone Age, and his presence effectively highlights the band’s stoner-rock and psychedelic side.

Homme does not take over the song — his vocal contribution instead gives it a distinctive desert-like, hypnotic groove. This is why “Snakes for Dinner” sounds like a natural meeting between Mastodon and QOTSA.

“Out Like a Lamb”

One of the most accessible and melodic rock tracks on the record.

At the same time, it retains Mastodon’s characteristic structure: the song does not remain a simple rock composition, instead gradually expanding through guitar solos and shifts in mood.

Some reviewers consider it the closest thing to a potential new live favorite.

“In the Ruins”

One of the most interesting compositions in terms of its creation history. Bill Kelliher had carried the main riff with him for more than 20 years before it finally found a place on an album.

The lyrics are connected to the personal tragedy of Troy Sanders. According to Brann Dailor, when Sanders recorded the vocals, it became clear that he was singing about experiences he had previously told almost no one about.

That is why “In the Ruins” is one of the most emotionally intense moments on “Marrow Deep“.

“They’re Coming For You”

A more experimental composition that does not reveal itself immediately. Its introduction creates a sense of anxiety, after which the song moves into a heavy but somewhat unconventional groove.

Some listeners consider it less convincing than the album’s central tracks, although its atypical structure demonstrates Mastodon’s desire not to repeat the same formula.

“Golden Spires”

One of the most atmospheric tracks.

Here, heaviness moves into the background, while keyboards and guitar textures create an almost psychedelic, dream-like space. Devolution Magazine compares some of the song’s ethereal moments to Pink Floyd. (devolutionmagazine.co.uk)

“Moth and Bone”

One of the tracks that listeners particularly praise for its combination of melody, progressive arrangements, and heavy sound.

It effectively demonstrates one of the main strengths of later Mastodon: the band no longer needs constant shredding or breakdowns to sound massive.

“A Vampire’s Demeanor”

Here Mastodon bring back a more aggressive vocal side.

The song features Randy Blythe of Lamb of God and Nate Newton of Converge, who contribute gang vocals.

It is one of the record’s most extreme moments and provides a good contrast to the atmospheric compositions in the album’s earlier section.

“The Vanishing”

A particularly important track because of its guests.

The opening features a bass part by Geezer Butler of Black Sabbath, while Joe Duplantier of Gojira also contributes to the song.

Butler’s involvement carries a special emotional significance: the song is connected to the death of Brann Dailor’s mother, and Geezer was her favorite member of Black Sabbath.

Musically, “The Vanishing” leans toward doom/stoner metal, with a distinct Sabbath influence.

“The Three Fates”

The album’s nearly eight-minute finale is its most progressive composition.

It features more complex instrumental interactions, keyboards, guitar solos, and jazz-inflected touches. Neil Fallon of Clutch contributes spoken-word vocals.

The finale does not attempt to provide a simple answer to the subject of death. Instead, it leaves the listener in a state of reflection.

The Special Role of the Guest Musicians

The guest list on “Marrow Deep” is one of the most interesting in Mastodon’s discography:

• Josh Homme — “Snakes for Dinner”;
• Geezer Butler — bass on “The Vanishing”;
• Joe Duplantier — “The Vanishing”;
• Randy Blythe — “A Vampire’s Demeanor”;
• Nate Newton — gang vocals;
• Neil Fallon — “The Three Fates”.

This is not simply a list of famous names. Virtually every guest has a thematic or musical connection to the specific song, so their appearances do not feel like random cameos.

Sound

“Marrow Deep” can be viewed as a return to heaviness for Mastodon without abandoning their progressive evolution.

Compared with “Hushed and Grim“, the new album is:

• heavier;
• more focused;
• less sprawling;
• more reliant on aggressive riffs;
• richer in sludge/stoner metal;
• while also making greater use of keyboards and atmospheric elements.

Metal Hammer highlights the return to the intensity of early Mastodon, while other reviewers emphasize that the new members give the band additional progressive and textural possibilities. (Louder)

It is important, however, not to expect a second “Leviathan“. This is not a literal return to the 2000s, but a modern Mastodon who, after personal tragedies, have once again allowed themselves to be very heavy.

Critical and Listener Reception

Professional reviews at the time of the album’s release were predominantly very positive.

Metal Hammer calls “Marrow Deep” a strong return to Mastodon’s metal essence and emphasizes that the band has managed to transform tragedy into life-affirming creativity. (Louder)

Kerrang! also rates the album very highly, calling it an emotionally turbulent yet excellent piece of work. The publication particularly emphasizes that the music reflects the conflicting feelings surrounding Hinds — love, conflict, loss, and grief all at once. (Kerrang!)

Riff Magazine gave the album 9/10, noting that after all the upheaval, Mastodon sound as if they have not simply preserved their identity but have discovered a new energy. (Riff Magazine)

Maximum Volume Music also rated the album 9/10, particularly praising the fact that the band did not attempt to create a “musical mausoleum” for Hinds, but instead made an album about moving forward with life. (Maximum Volume Music)

However, the reaction is not unanimous. Heavy Blog Is Heavy feels that the album lacks several truly monumental riffs on the level of “Blood and Thunder”, “Oblivion”, or “The Wolf Is Loose”. In the reviewer’s opinion, “Your Ghost Again” is the most convincing track, but primarily because of its melody and progressive layers rather than pure guitar aggression. (Heavy Blog is Heavy)

The Soundboard also considers the album somewhat more restrained and less immediate than some of the band’s classic works, although it emphasizes its emotional strength and importance for Mastodon’s new chapter. (The Soundboard)

What Was Especially Well Received

Among the strengths most frequently highlighted are:

• the return of a heavier sound;
• Brann Dailor’s drumming;
• the vocal performances of Troy Sanders and Dailor;
• Nick Johnston’s guitar work;
• the atmospheric keyboards of João Nogueira;
• “Your Ghost Again”;
• “In the Ruins”;
• “The Vanishing”;
• the well-chosen guest musicians;
• the album’s emotional honesty.

In fan discussions, “In the Ruins”, “The Vanishing”, and “Moth and Bone” are particularly frequently singled out, although opinions on the best tracks vary considerably. (Reddit)

What Some Listeners May Not Like

The main criticism is the absence of a new undisputed Mastodon classic for those who compare the album with “Leviathan“, “Blood Mountain“, or “Crack the Skye“.

Some listeners may also find that “Marrow Deep” is at times too progressive and measured, particularly if they expect a constant stream of powerful riffs.

In other words, this is not “Mastodon returning to Remission.” Rather, it is Mastodon after surviving tragedy — more reflective, but also heavier.

Overall Summary

“Marrow Deep” is one of the most significant albums in Mastodon’s later history, not so much because of its musical experimentation as because of the context in which it was created.

It is the band’s first record without Brent Hinds, and his absence is felt on virtually every level. But Mastodon do not attempt to fill the void by copying their former guitarist. Nick Johnston brings his own voice, João Nogueira expands the band’s sonic palette, while Brann Dailor, Troy Sanders, and Bill Kelliher demonstrate that the band’s core remains exceptionally strong.

“Marrow Deep” works best as an album about dealing with loss rather than an album about death. “Your Ghost Again” speaks to the memory of Hinds, “In the Ruins” addresses Sanders’ personal pain, “The Vanishing” is connected to Dailor’s mother, while the closing “The Three Fates” leaves the subject of life and death open-ended.

Musically, Mastodon have found an interesting balance: the heaviness of their early years + the progressiveness of a mature band + new atmospheric elements. This is not a return to the past, but an attempt to understand how to move forward.

Who might enjoy it: fans of Mastodon, Gojira, Baroness, Opeth, Neurosis, High on Fire, Queens of the Stone Age, Tool, and progressive/sludge metal. The album is particularly worth exploring for listeners who enjoy massive riffs, complex compositions, psychedelia, atmospheric keyboards, and music that combines technical musicianship with strong emotional substance.