Bert Bailey wrote:

>Martha Argerich has, apparently, cancelled a whole slew of concerts
>this year.

I thought she was undergoing treatment for cancer a few years ago,
which occasioned her cancellations.  I was under the impression that
her treatment had been successful and that her appearances were now
less susceptible to unexpected cancellation.  I hope that this resurgence
of cancellations doesn't bespeak a relapse.

>Leonard Bernstein is one who replaced a sick conductor,

The sick conductor was Bruno Walter.

Walter Meyer