Yo-Yo Ma in movie?

I have seen a movie, in which Yo-Yo Ma played Yo-Yo Ma, years and years ago. I would like to find this movie, but I can't remember the title etc.. All I remember from the movie is that a female physician, who played cello herself in a master class, had to tell a taxi driver, that he is deadly ill. He left doctor' s office, got in his taxi. Then he drives Yo-Yo Ma to a concert, but they get stuck in traffic, so he starts playing in the taxi. Can anybody help me finding this movie? I believe it was a canadian production, but I am not sure.