Imagine the sensation of realizing that you’re unprepared for a test – that you’ve been studying the wrong subject. It was sort of like that when pianist Maria Joao Pires heard the Royal Concertgebouw Orchestra begin to play Mozart’s D minor piano concerto. She had thought she’d be playing a different concerto by Mozart on that mid-day concert.  The resulting confusion was caught on tape, as part of a documentary.

Here’s the segment, from Frank Scheffer’s ‘Attrazione d’Amore”, which is the documentary about the orchestra, and conductor Riccardo Chailly.  (The scene begins :42 into the clip)