Black One is the fifth album by Sunn O))). It is a combination of both experimental and traditional Sunn O))), utilizing many guest musicians, including black metal musicians Malefic and Wrest from Xasthur and Leviathan, respectively. The band supposedly also went so far as to lock the claustrophobic Malefic in a casket to record the vocals on "Báthory Erzsébet". 2,000 copies included a bonus disc titled Solstitium Fulminate, containing a mix of live performances recorded at Roskilde Festival in 2005 and the immediately preceding European tour. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.