Some follow-up on Yes. Their vocal harmonies owe a great debt to Chris Squire's childhood when he sang in a prestigous British chorus. Their song structures owe a great debt to Jean Sibelius, since Jon Anderson admired him greatly. According to some sources, Yes was formed as an attempt to take the experimentation done by the Beatles to another level. A great question of debate is Which member is the crucial link to Yes? Most would say Jon Anderson but the band has created albums without him. In my personal opinion, Chris Squire is the crucial link. He has played with every incarnation of Yes and is a founding member. His bass is a trademark of the Yes sound, as is his high backing vocals.