The band's core members are Stephen O'Malley (also of Khanate and Burning Witch) and Greg Anderson (of Goatsnake and Engine Kid).

Festival in Utrecht, the Netherlands, including Annette Peacock, Magma, Julia Holter and The Crazy World of Arthur Brown, and Sunn O))) itself.

On White1 and White2, the band noticeably expanded on conceptualization by inviting several guests, resulting in everything from quiet meditative ambient sounds ("A Shaving of the Horn that Speared You" from White1) to a bizarre bass experiment track ("bassAliens" from White2).

Black One continued in this direction, utilizing far more electronics, synthesizers, and other instrumentation than earlier Sunn O))) material, yet still marking a significant return to its traditional sound.

Sunn O))) is widely regarded as leaders in the genre, including by The New York Times Magazine of May 28, 2006, when the band was written up in an article called "Heady Metal" by John Wray.