BBC News said:One of the world's leading pianists has surprised concertgoers by storming off stage because a fan was filming his performance on a smartphone.
Krystian Zimerman, 56, returned moments later and declared: "The destruction of music because of YouTube is enormous."
He carried on with his recital, but chose not to perform an encore and cancelled a post-concert reception.
Source: http://www.bbc.co.uk/news/technology-22780812
On the one hand I can understand why he was angry and I respect his point of view. On the other hand, I'd never go to his concerts and one of the few ways I'd discover his work, let alone his existence, would be through sites such as Youtube. I'd rather have my work noticed than miss out on payment or whatever, although I know in his case he'd been refused work or some such. Still, if you're a leading figure in your interest that work should be plenty.