Boris is a Japanese band formed in 1992 in Tokyo and composed of drummer Atsuo, guitarist/bassist Takeshi, and guitarist/keyboardist Wata. All three members contribute vocals. Their work has drawn variously on styles such as sludge metal, drone, noise, psychedelia, and minimalism. Boris has released more than 20 studio albums on various labels around the world, as well as a variety of live albums, compilations, EPs, singles, and collaborative albums. They have collaborated with acts such as Sunn O))), Merzbow, Keiji Haino, and guitarist Michio Kurihara.

Sunn O))) is an American drone metal band formed in 1998 in Seattle, Washington. The band is known for their distinctive visual style and slow, heavy sound, which blends diverse genres including doom metal, drone, black metal, dark ambient, and noise rock, as well as for their extremely loud live performances.