Aleister Crowley intoning the first four Collects from the Gnostic Mass:
A MIDI file of a simple intonation for the “A Ka Dua” mantram from the Gnostic Mass, based on the bar of music in Book Four, Part One, Chapter II. [A Ka Dua MIDI]
Sheet music for the Anthem of the Gnostic Mass, composed by Frater H.K..
Richard Kaczynski has rendered this music as a MIDI file, which is available here.