Altar is a collaboration album between Japanese sludge/doom band Boris and American drone doom duo Sunn O))), released on October 31, 2006 through Southern Lord Records. A limited two CD edition was released on October 23rd 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 2xCD version in 2006 which features a bonus track on the first disc, "The Singing Bell (Black Sheep)," and also features "Her Lips Were Wet with Venom" on disc 2.
Altar is a house music duo of Brazilian producers and DJs Macau and VMC. Formed in 2001, the duo began receiving recognition in nightclubs in 2003 after the release of their single "Sexercize". A collaboration with vocalist Jeanie Tracy, "Party People" became their first number-one hit on the U.S.