Opeth is a Swedish progressive death metal band from Stockholm. Formed in 1990, the group has been through several personnel changes, singer, guitarist, and songwriter Mikael Åkerfeldt has remained Opeth's driving force throughout several years. While their style is firmly rooted in Scandinavian death metal, Opeth has consistently incorporated progressive, folk, blues-rock and jazz influences into their usually lengthy compositions. Many songs include acoustic guitar passages and strong dynamic shifts, as well as both death vocals and singing. Opeth rarely made live appearances supporting their first four albums; but since conducting their first world tour after the 2001 release of Blackwater Park, they have led several major world tours.
Opeth has released nine studio albums, three live DVDs, three live albums (two in conjunction with DVDs), and two boxsets. The band released its debut album Orchid in 1995. Although their eighth studio album, Ghost Reveries, was quite popular in the United States, Opeth did not experience major American commercial success until the 2008 release of their ninth studio album, Watershed, which peaked at number twenty-three on the Billboard 200, and topped the Finnish albums chart in its first week of release.