Valentina Lisitsa

Valentina Lisitsa is a pianist whose worldwide reputation was built on social media. She is now experiencing a major backlash due to what she's been writing on Twitter.

It came to a head with the cancellation of Lisitsa's scheduled performances Wednesday night and Thursday night with the Toronto Symphony Orchestra, which announced earlier this week that she would not be appearing to play Rachmaninoff's Piano Concerto No. 2 with the ensemble and Finnish conductor Juka-Pekka Saraste. Both TSO management and Lisitsa have said she will still receive her full fee.

Born in Kiev a little more than 40 years ago, Valentina Lisitsa came to America in the early '90s to work as a concert pianist.

How do classical artists grab attention these days? Simple — or, actually, not so simple at all. They build their fan bases on YouTube, one page hit at a time.