I just learned this now. I am in tears. Every jazz piano riff I know is distilled Oscar. All things must pass. I simply cannot believe my reaction to this news. I would like to add that he also was Provost of York University, and received the Order of Canada. As a keyboardist, he was the Prime Canadian.
Farewell teacher. Goodbye Dr. Peterson.
Adeste Fidelis, Urbi et Orbi