Mastodon is an American heavy metal band from Atlanta, Georgia, formed in early 2000 and composed of bassist Troy Sanders, guitarist Brent Hinds, guitarist Bill Kelliher and drummer Brann Dailor. Many of their songs feature progressive concepts and unique instrumentation with a mix of clean vocals and harsh screams.Mastodon has released five studio albums, a live album and accompanying DVD, a compilation of early material and a box set. The band released its debut album Remission in 2002, which garnered significant critical acclaim for its unique sound. Their second release, Leviathan, was based on the famous American novel by Herman Melville, Moby Dick. Three magazines awarded it Album of the Year in 2004: Revolver, Kerrang! and Terrorizer. Mastodon achieved major American commercial success with its 2011 album The Hunter, which debuted at number ten on the Billboard 200 chart.Legacy and receptionThe "sludge/stoner/alternative metal outfit" Mastodon, as labelled by Allmusic, is "one of the preeminent metal acts of the early 21st century". The BBC stated about Mastodon: "They might be bonkers of lyric, full of fantasy mumbo jumbo, but the band is unashamedly committed to its complex-of-composition craft, and the results have frequently stunned ever since their 2002 debut, Remission. They are the most ambitious, most fearless, most fun heavy metal band to have breached the mainstream since the genre oozed its way out of the Midlands in the 1970s." Alternative Press has stated: "Mastodon are one of the all-time great hard-rock groups." Rolling Stone stated: "Mastodon are the greatest metal band of their generation — no one else comes close."