Sorry to hear this. Fine pianist, composer, educator and arranger. And he left us some magnificent recordings:
Mahler 4, Vaughan Williams symphonies, Walton 1st, Elgar symphonies, Planets, Carmina Burana, Goldmark's Rustic Wedding, Shostakovich 8th, and above all a superb Rachmaninoff 2nd (EMI). His early RCA recordings were so exciting. I was lucky enough to catch him with the LA Phil several times - quite memorable. Perhaps the only musician out there who could rival Bernstein as an all-round musician. RIP.