Maria Joao Pires

[giles.enders]

Not quite unsung but rare:  Did any one hear or see the Amsterdam orchestra start to play the wrong piano concerto with Maria Joao Pires.  It can easily be googled

[chill319]

An extraordinary event, to be sure, though thank goodness it occurred at rehearsal -- and not perhaps quite as extraordinary as Gershwin forgetting his own scores in concert (shortly before succumbing to a brain tumor). If Ms. Joao Pires left her music at home, that would be in Brazil these days, a bit of a trek from Amsterdam.

[Alan Howe]

Here's a link:
http://blogs.telegraph.co.uk/news/damianthompson/100243153/pianist-maria-joao-pires-panics-as-she-realises-the-orchestra-has-started-the-wrong-concerto/
Of course, it was a public rehearsal...