Mastodon is an American heavy metal band from Atlanta, Georgia, formed in early 2000 and composed of bassist Troy Sanders, guitarists Brent Hinds and Bill Kelliher and drummer Brann Dailor. Their musical style features progressive concepts and unique instrumentation. All four members participate in vocals, creating a unique blend of singing styles and voices. Mastodon has released six studio albums, as well as a number of other records. The band's debut album, Remission, released in 2002, garnered significant critical acclaim for its unique sound. Their second full-length release, Leviathan, is a concept album based on the novel Moby-Dick by Herman Melville. Three magazines awarded it Album of the Year in 2004: Revolver, Kerrang! and Terrorizer. The song "Colony of Birchmen" from their 2006 third album, Blood Mountain, was nominated for a Grammy Award for Best Metal Performance in 2007. Blood Mountain was followed in 2009 by Crack the Skye, and in 2011 by The Hunter, which achieved major commercial success in the United States, debuting at No. 10 on the Billboard 200 chart. The Hunter features the song "Curl of the Burl", which was nominated for a Grammy for Best Hard Rock/Metal Performance in 2012. Mastodon's 2014 release, Once More 'Round the Sun, peaked at No. 6 on the Billboard 200 chart and features the band's third Grammy-nominated song, "High Road".