This movie is about the fraud that took place

I am to see this movie soon, hence wanted to know more about it... With no info about it here I'd like to help others by sharing my findings:

Apparently "Miss Hatto" was a great pianist, who toured doing solo shows as well as accompanying others, but she began a relationship with a convicted con artist who decided to cash in on her ability by selling recordings with music from OTHER pianists, but labelled them as being Hatto's. She died of cancer recently, and was widely regarded as a "fraud", although it was possibly all the conman's doing.

This is her story.

(This movie's message will possibly mean a lot to me because I lost my somewhat naive but honest and upstanding mother to cancer recently, AND it turns out my father, who died just before her, was a lying scumbag.)