Aphrodite's Child was a Greek rock and pop band formed in 1967, by Vangelis Papathanassiou (keyboards, flutes), Demis Roussos (bass, acoustic and electric guitar, vocals), Loukas Sideras (drums and vocals), and Silver Koulouris (guitar). They initially found success in Europe with hit singles like "Rain and Tears", "End of the World", "I Want to Live", and "It's Five O'Clock", before pivoting to progressive rock with their third and final album, 666 (1972). An ambitious concept album inspired by the Book of Revelation, it later gained critical acclaim and has appeared on a number of lists of the top progressive and psychedelic albums of all time.

Source: Wikipedia (https://en.wikipedia.org/wiki/Aphrodite%27s_Child)