Mastodon is an American metal band from Atlanta, Georgia, formed in 2000. The group is composed of Troy Sanders (bass/vocals), Bill Kelliher (rhythm guitar/backing vocals), and Brann Dailor (drums/vocals). The band's lead guitarist was Brent Hinds from 1999-2025. Mastodon has released seven studio albums, as well as a number of other releases. The band's 2002 debut album, Remission, garnered significant critical acclaim for its unique sound. Mastodon's second full-length release . Popular albums include "Emperor of Sand", "Once More 'Round the Sun", "Crack the Skye" and "Leviathan".