Rhapsody in Blue is one of my favorite compositions. It's too complex to call just a "song". I've heard dozens of recordings of it, watched it live at the Hollywood Bowl, and recorded it for the high-school orchestra way back when. I've known some very talented people who could play the piano part, and they all agreed it was very challenging to play correctly.
The young lady pianist in the video, Khatia Buniatishvili, is astoundingly good. She doesn't miss a single note, and puts a lot of emotion into a piece that most pianists are struggling to play correctly.
This is also an excellent recording, and I think it's worth the 15 minutes to watch it.