Sunn O))) are a musical project that has made a name for itself in the avant-garde and experimental metal scene. The group was founded in Seattle, Washington, in 1998 by Greg Anderson and Stephen O'Malley, both of whom had been involved in various underground metal bands. The name "Sunn O)))" is a play on the name of the amplifier brand Sunn, and the band is known for their use of extremely loud and heavy sounds.