Answer by taking a quote from the following article:

Evangelos Odysseas Papathanassiou (Greek: Euaggelos Odusseas Papathanasiou, IPA: [ev'anjelos odi'seas papathana'siu] (born 29 March 1943), best known professionally as Vangelis (), is a Greek composer of electronic, progressive, ambient, jazz, and orchestral music. He is best known for his Academy Award-winning score for the film Chariots of Fire, composing scores for the films Blade Runner, Missing, Antarctica, 1492: Conquest of Paradise, and Alexander, and the use of his music in the PBS documentary Cosmos:

When Vangelis was twelve years old he became interested in jazz music, and with the social movement to rock and roll. At fifteen years old he started to form early school bands, not to cover other musicians, but to have fun, resulting in the early 1960s being one of the founders of pop rock group The Forminx (or the Formynx), which became popular in Greece. Based in Athens, the five-piece band played a mixture of cover versions and their own material, the latter written mostly by Vangelis (with lyrics by DJ and record producer Nico Mastorakis) but still sung in English. The Forminx released nine hit singles and a Christmas EP before disbanding in 1966 at the peak of their success. A film being made about them at the time, which was initially directed by Theo Angelopoulos, was never fully completed, and the songs, composed for the movie, were never released. Vangelis spent the next two years mostly studio-bound, writing and producing for other Greek artists.  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:  I moved into the record industry. I was under the impression that in order to be alive and to be able to create what I had in mind I had to become successful. I realised that success and pure creativity are not very compatible... Instead of being able to move forward freely and do what you really wish, you find yourself stuck and obliged to repeat yourself and your previous success.

When was it founded?
1960s being one of the founders of pop rock group