Opeth is a Swedish progressive metal band formed in 1990. Known for their unique blend of heavy metal and acoustic elements, they often incorporate complex song structures and diverse musical styles. The band's sound features a mix of growled and clean vocals, showcasing their versatility. Over the years, Opeth has released several critically acclaimed albums, including Blackwater Park and Ghost Reveries. Their music often explores themes of nature, loss, and existentialism, appealing to a wide range of listeners. The band has gained a dedicated fan base and is recognized as a significant influence in the progressive metal genre.