Sunn O))) is an American drone metal band formed in 1998, known for their heavy, immersive sound characterized by deep, distorted guitar tones, minimalistic structures, and atmospheric elements. The band, primarily composed of Stephen O'Malley and Greg Anderson, often incorporates experimental and avant-garde influences into their music. Sunn O))) is recognized for their unique live performances, which often feature elaborate visuals and a theatrical presence. Their work explores themes of spirituality, darkness, and the power of sound, making them a significant force in the underground music scene.