Anthony John Selvidge, known professionally as Tony Kaye, is an English keyboardist, best known as a founding member of the progressive rock band Yes. Born into a musical family, Kaye was classically trained and intended to become a concert pianist before he developed an interest in jazz and contemporary rock and pop music. He joined several groups through the 1960s, including the Federals, Johnny Taylor's Star Combo, Jimmy Winston & His Reflections, and Bittersweet.

Christopher Russell Edward Squire was an English musician, singer and songwriter best known as the bassist and backing vocalist of the progressive rock band Yes. He was the longest-serving original member, having remained in the band until his death and appearing on every studio album released from 1969 to 2014. In 2017, he was posthumously inducted into the Rock and Roll Hall of Fame as a member of Yes.