Salvador Dali wrote a fantastic script for directing a great happening in Barcelona, for the premiere of "666". See also: Meeting Salvador Dali told by Costas Ferris.
This controversial double album is a concept work based on a book of Costas Ferris.
When they decided to make "666", Lucas said that now they needed a guitar, and so they remembered Argyris and called him especially.
Di Cavalieri himself in his letters insists that it is the first opera ever created, but the religious essence of his work and the static evolution of his "drama", imposed the term of "oratorio" instead.
The album "666" was ahead of its time and some of the themes were very unusual.
The compositions are more complex than previous works of Aphrodite's Child and there are extended instrumentals and improvisations.
So there was a whole channel with the voice of Vangelis, giving directions and enthusiasm.
During the remix, they chose some of those phrases, which were interesting rythmically.