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Mastodon is an American heavy metal band from Atlanta, Georgia, formed in 1999. The band is composed of bassist/vocalist Troy Sanders, guitarist/vocalist Brent Hinds, guitarist Bill Kelliher and drummer/vocalist Brann Dailor. They have released five full-length albums to date, with 2009's Crack the Skye selling 41,000 copies in the United States in its first week of release to land at position No. 11 on The Billboard 200 chart.