>The observation that Serkin also hummed "is" irrelevant because it must
>have been done un-intrusively; this is the first time I've heard that
>Serkin hummed. Obviously, Serkin was respectful of the music.
Not live, it wasn't unobtrusive. Thin, cracked, high (something like
Tiny Tim), wavering, and off-key. Definitely noticeable. But, once one
registered it, it didn't seem to matter and nobody threw eggs or walked
out or shouted "C'est un scandale!"