Mastodon is one of the new breed of metal bands from the US. They created waves in the metal community with the EP Lifesblood, released in 2001, just over a year after the band's formation in 1999 in Atlanta, GA, USA.

The band appeals to fans of both hardcore/noisecore and extreme metal, while combining elements of progressive music and beyond. Mastodon was first signed to Reptilian Records in 2000, shortly after recording their demo. Soon after this and the release of a little-known EP called "Slick Leg," however, the band was signed to Relapse Records - the label on which Mastodon's most critically acclaimed work was released: "Lifesblood," an EP in 2001; "Remission," the band's first full length album in 2002 and "Leviathan," the band's most popular release to date, in 2004. (A concept album based around Herman Melville's classic book, Moby Dick. This album featured more art work of Paul Romano.)

It was announced, in late 2005, that, having fulfilled contractual obligations to indie label, Relapse Records, Mastodon had been offered a deal by a major music label, a spot on the Warner Music roster alongside such bands as Green Day and My Chemical Romance. Despite this, however, Relapse Records released a DVD, and re-released the band's only demo.

An album titled "Call of the Mastodon", comprising the material recorded for the band's first and only untitled demo, which featured Eric Saner on vocals, was released in early 2006. A DVD entitled "The Workhorse Chronicles" was released not long after and a full length album, the band's Warner Music début, "Blood Mountain," was released September 12th, 2006. In an interview with MTV news, Brann Dailor revealed that the band's sound, on this upcoming release would be decidedly different and more "progressive." He also expressed excitement over the possibility of the birth of a new "prog movement," naming bands such as Isis, along with Mastodon, as prospective leaders of said movement.

"Blood Mountain" met critical acclaim with reviews ranging from Metal Hammer and Kerrang! who stated it was as good or better than their last release Leviathan, while other critics view it as the essential release of the decade and UK Metal Hammer named it best album of 06. "Blood Mountain" featured some guest work by Josh Homme of Queens of the Stone Age fame and Cedric Bixler from The Mars Volta.

Late 2008 will see the release of a new album, the tracks from which Brann Dailor (drummer) has said are 'Heavier than I expected' and will boast more of their honed progressive sound which includes leads and time changes.

Mastodon have previously appeared on the second stage at Ozzfest 2005 and have toured with the likes of Slayer, Lamb of God and Children of Bodom on the Unholy Alliance US tour and have 3 songs recorded live on the accompanying tour DVD.

Mastodon is:
Brann Dailor - Drums. (Formerly of Today Is The Day, Lethargy.)
Troy Sanders - Vocals, Bass. (Also in Social Infestation, Four Hour Fogger.)
Bill Kelliher - Guitar. (Formerly of Today Is The Day, Lethargy.)
Brent Hinds - Guitar, Vocals. (Also in Fiend Without A Face.)

Aforementioned former member, Eric Saner, left the band soon after the release of the 2000 demo. Troy Sanders, the then bassist, was announced as the new lead vocalist, although vocal duties were increasingly shared with guitarist Brent Hinds to the point where they are considered co-vocalists.