Earth is an American musical group based in Olympia, Washington, formed in 1989 and led by the guitarist Dylan Carlson. Earth's music is nearly all instrumental, and can be divided into two distinct stages. Their early work is characterized by distortion, droning, minimalism, and lengthy, repetitive song structures. The band's later output reduces the distortion while incorporating elements of country, jazz rock, and folk. Earth is recognized as a pioneer of drone metal, with the band's Earth 2 being regarded as a milestone of the genre.

Sunn O))) (pronounced "sun") is an American experimental metal band from Seattle, Washington, that formed in 1998. The band is known for a heavy and slow sound, that blends diverse genres including drone, black metal, dark ambient and noise rock, and for very loud live performances. The band's core members are Stephen O'Malley (also of Khanate and Burning Witch) and Greg Anderson (of Goatsnake and Engine Kid).