This is a fairly incredible moment in a pretty good movie about a man (named 1900) who is able to spontaneously translate emotion into music.  Tim Roth was born on this cruise ship, has never been off of it, has never had a woman, and catches a moment with Melanie (this is much of her role in the movie.)  She's never been more beautiful.  Never.  Oh, and the piano piece is pretty good too.
The Legend of 1900