Ars Electronica: An Evening with BCC Distinguish Artist PATRICK MORAZ. Patrick Moraz is a progressive rock keyboard player. He is best known as the keyboardist for the progressive rock band Yes, from 1974 to 1976, and the Moody Blues from 1978 to 1991. He was classically trained at the Conservatory of Lausanne, but played jazz primarily before entering progressive rock and has been highly acclaimed for his virtuosity.