It is arranged like a symphony or suite, divided into movements with different moods. The 4th movement features complex percussion, with reminiscence to West African tribal drumming.[5]
Vangelis plays all instruments, mainly synthesizers, himself. There is choral input on all tracks, and a solo male vocal on the fourth track, but all are uncredited. The choir, as in Vangelis' other choral work, sings seemingly random syllables chosen for their timbre. Similarly, the male tenor vocal of track 4 sings lyrics in a made-up language that resembles Latin. In later interviews it was revealed that the choir is probably the English Chamber Choir and that the male vocalist is Guy Protheroe; the choir also featured on Heaven and Hell (1975).
Specific synthesizer patches are Vangelis' strings from Roland's VP-330 and synth brass from Yamaha's CS-80, a piano (track 3), a marimba-like sequence (track 4), sharp arpeggio sequences from Sequential Circuits' Prophet 10 (tracks 1 and 5) and a deep mallet percussion (track 5). Timpani and snare drums are the main percussion instruments; both appear to be samples (Emulator I/Emulator II).
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