Oh dear.  I meant David Dubal from Juilliard, the author of a big fat
doorstop of a book about the Western musical canon.  Yes, a professor of
piano. Was the original poster talking about him or about somebody else
called Duval?

-Margaret Mikulska

 [I think we've pretty much established that the person in question is
 David Dubal, the previous being a typo.  -Dave]