The term "Tetragrammaton" refers to the Hebrew name of God considered by some to be unspeakable (YHWH, or "Yahweh", translated as "Jehovah" in English).
This avant-garde album was recorded by John Lennon and Yoko Ono and featured nude photos of the pair on the front and back cover.
The records were held as evidence in a court case, which made it impossible for the label to sell them at the time.
Tetragrammaton did however release a single of the Lennon/McCartney song "Hey Jude" from the Captain Milk recording sessions.
Tetragrammaton's co-founder, Marvin Deane, died of heart failure on August 16, 2010, in Los Angeles, California, at age 79.