Opeth are a Swedish progressive metal band from Stockholm, formed in 1990. The band incorporates folk, blues, classical, and jazz elements into its usually lengthy compositions, as well as strong influences from death metal, especially in their early works. Songs may include acoustic guitar passages, Mellotrons, death growls, and strong dynamic shifts.

Progressive metal is a broad fusion music genre melding heavy metal and progressive rock, combining the loud "aggression" and amplified guitar-driven sound of the former with the more experimental, cerebral or quasi-classical compositions of the latter.