Mastodon is an American heavy metal band from Atlanta, Georgia, formed in early 2000 and composed of bassist/vocalist Troy Sanders, guitarist/vocalist Brent Hinds, guitarist Bill Kelliher and drummer/vocalist Brann Dailor. The band is known for their unique "sludgy" sound, mixing clean and distortion-heavy instrumental work and often involving intricate instrumental passages and use of vocal harmonies. They have released five full-length albums to date, with their latest album, 2011''s The Hunter, debuting at No. 10 on The Billboard 200 chart.