Monoliths & Dimensions is the sixth studio album by the avant-garde drone doom band Sunn O))). The album was created and recorded over a period of two years and features the collaborations of composer Eyvind Kang, Australian guitar player Oren Ambarchi, Hungarian vocalist Attila Csihar, Dylan Carlson from the drone band Earth, and trombonists Julian Priester and Stuart Dempster. Also present is an upright bass trio; French and English horns; harp and flute duo; piano, brass, reed, and string ensembles; and a Viennese woman's choir led by Persian vocalist Jessika Kenney.