Here's what wikipedia say's about the album:
IAO (subtitled Music in Sacred Light) is an album by John Zorn inspired in part by the Beast and the number 666: the Kabbalistic identity of IAO, which are the initials of Isis, Apophis and Osiris, used as a magical formula in the Hermetic Order of the Golden Dawn.
Pretty intense album, I suggest all fans of Avantgarde MUSIC check it out.
IAO:Music In A Sacred Light - John Zorn [2002]

1.Invocation
2.Sex Magick
3.Sacred Rites of the Left Hand Path
4.The Clavicle of Solomon
5.Lucifer Rising
6.Leviathan
7.Mysteries