Krystian Zimerman is a Polish pianist, regarded as one of the best in the world. As is often the case with such artists, he can be a little temperamental.
During a concert in June 2013, he stormed off the stage during a performance, later coming back and telling the audience why. He resumed the performance. His reasons were similar to that of the actor James McAvoy, who stopped while playing Macbeth on stage in April 2013.
So what was the problem?
[+ Show Answer]
Zimerman (as did McAvoy) saw someone filming the performance and took objection to it. He then berated the uploading of such live performances on YouTube, citing lost income due to such actions.
More details here.