My favorite piano player on the Youtube: CalikoKat's account has been terminated, because his own personal piano arrangements of popular music was considered copyright infringement because it was too good and well played. I guess copyright infringement is only OK as long as your imitation is lousy and incompetent. As soon as it becomes too good, the internet police will take it down.
I guess the only way I can listen to his music now is by playing his sheet music with my own hands. But I am not nearly as good as he is :(