Altar is a collaboration album between experimental music groups Boris and Sunn O))), released on October 31, 2006 through Southern Lord Records. A limited two-CD edition was released on October 23 via Southern Lord with a 28-minute bonus track with Sunn O))), Boris, and Dylan Carlson, titled "Her Lips Were Wet with Venom". Inoxia Records released their own two-CD version in 2006 which features a bonus track on the first disc, "The Sinking Belle (Black Sheep)", and also features "Her Lips Were Wet with Venom" on disc 2. The triple-vinyl edition by Southern Lord contains all of the songs from their two-CD edition, additional pictures, and liner notes by Kim Thayil. The Daymare 3LP version was released March 23, 2007 and features a bonus track not found on any other version of this release: "The Sinking Belle (White Sheep)".
In addition to major players Sunn O))) and Boris, Altar also boasts an extensive roster of guest musicians/collaborators such as Kim Thayil (Soundgarden), Joe Preston (Earth, Thrones, Melvins, High on Fire), Phil Wandscher and Jesse Sykes (both of Jesse Sykes and the Sweet Hereafter) as well as long time Sunn O))) collaborators TOS Niewenhuizen and Rex Ritter.
On December 10, 2007, the bands collaborated at the Forum in London along with a number of the guests featured on Altar for a live performance. A 3LP picture disc version of the album, limited to 500 copies, was sold exclusively at this London show.
|Year||Label||Format||Country||Out of Print?||Notes|
|2006||Southern Lord||2CD||U.S.||Yes||Ltd. 5000. Includes bonus track "Her Lips Were Wet with Venom"|
|2006||Inoxia Records||2CD||Japan||Yes||Ltd. 1000. Includes bonus tracks "The Sinking Belle (Black Sheep)" and "Her Lips Were Wet with Venom"|
|2006||Southern Lord||3LP||U.S.||Yes||Ltd. 10,600. Includes bonus track, "Her Lips Were Wet with Venom"|
|2007||Inoxia Records||3LP||Japan||Yes||Ltd. 1000. Includes bonus tracks "The Sinking Belle (White Sheep)" and "Her Lips Were Wet with Venom"|
|2007||Southern Lord||3LP Pic Disc||U.S.||Yes||Ltd 500. Originally sold at London performance on December 10, 2007|