Founded by Greg Anderson and Stephen O'Malley, Sunn O))) is an experimental drone metal band that formed in Seattle, Washington, in 1998 originally under the name "Mars".

[1] The band signed with Hydra Head Records, founded by Isis frontman Aaron Turner, and released both The Grimmrobe Demos and its debut album ØØ Void.

Their interest in pushing the boundaries of metal music culminated in the orchestral Monoliths & Dimensions (2009), a critically acclaimed[3] album that broke through the underground scene, landing on Billboard's Top Heatseekers chart.

The band's next album Kannon was born out of the Monoliths & Dimensions sessions and centers its theme around the female Buddhist Goddess of Mercy.

In 2019, the band released Life Metal, featuring a comparatively more positive tone and mood, and Pyroclasts, a meditative experimental album produced by Steve Albini (Shellac, Big Black).