Opeth is a solitary progressive/extreme metal band from Sweden. Their fifth album, Blackwater Park, was released in 2001. This album, which led to the band's breakthrough, is even more dramatic, detailed, and innovative than their previous works. Filled with a worldview that is inextricably linked to stillness and movement, sadness and anger, life and death, and constructed with a unique sound, this album could be said to be one of the greatest masterpieces in the history of metal. From this point on, Opeth's music evolved even further, and remains highly popular around the world to this day. It's a must-listen for metal fans.