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One of the album's themes was used as the theme tune of the television documentary series Cosmos (by Carl Sagan), which also included some other music by Vangelis among others.
"Heaven and Hell" has two tracks:
Older pressings of the LP version have a more elaborate track listing:
Vangelis plays synthesizers, grand piano (Bösendorfer), percussion and several other instruments.
The choirs are by the English Chamber Choir , conducted by Guy Protheroe . Lead vocals on "12 O'Clock" are by Vana Veroutis .
Jon Anderson contributes lead vocals to "So Long Ago, So Clear". This was to be the first product of a collaboration (spanning 20 years) between the two artists, sometimes as Jon & Vangelis.As stated, this was a more classical effort by Vangelis, contrasting with the progressive rock on Earth and Albedo 0.39, which was released less than a year later. He would later return to classically-styled work on Mask.