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MainlyMozartSD OP t1_iqw79s5 wrote

Uh, never? ;)

Truthfully, at the top professional level it doesn't happen much. It can happen, but rarely in commonly played pieces; it would tend to happen in some sort of unfamiliar or extremely challenging work, and where there's some kind of extenuating circumstance (e.g. problem on stage in the opera, some kind of technical difficulty, etc.)

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