“To Be Over,” the closing track on ‘Relayer,’ demonstrates the creative high that Yes was on in 1974.

This is the closest Yes gets to sounding like the jazz-fusion of Mahavishnu Orchestra, rather than simply the world’s greatest progressive rock band.

Yes sounded looser and more passionate than ever, even as the band lost another key member ahead of 1974’s ‘Relayer.’

We go in depth on one of Yes’ most inventive albums, ‘Relayer.’ Released 40 years ago today, it now represents a road not taken.

Patrick Moraz stops in to discuss his endlessly varied career with Yes, the Moody Blues and as a solo artist.