666 (subtitled The Apocalypse of John, 13/18) is the third and final studio album and only double album by Greek progressive rock band Aphrodite's Child, released in June 1972 by Vertigo Records. Ostensibly an adaptation of Biblical passages from the Book of Revelation, it is the group's most critically acclaimed project. Due to internal tensions during the recording process and conflict with the record company, by the time it was released the band had already disbanded and its members had begun work on solo projects.