Around the time of the student riots in 1968, Vangelis founded progressive rock band Aphrodite's Child together with Demis Roussos, Loukas Sideras, and Anargyros "Silver" Koulouris. After an unsuccessful attempt to enter the UK, they found a home in Paris where they recorded their first single, a hit across much of Europe called "Rain and Tears". Other singles followed, including two albums, which, in total, sold over 20 million copies. The record sales led the record company to request a third album, and Vangelis went on to conceive the double-album 666, based on Revelation, the last book in the Bible. It is often listed as one of the best progressive rock albums. One of the many remarkable features of this album is Irene Papas's guest participation (vocal on "Infinity"). Tensions between members during the recording of 666 eventually caused the split of the band in 1971, but the album was still released in 1972. Despite the split, Vangelis has since produced several albums and singles for Demis Roussos, who, in turn, contributed vocals to the Blade Runner Soundtrack. He often recalls on music industry: