First off, don't try to learn from Synthesia. Seriously, it's not going to help you at all. Get good at reading sheet music. It's necessary to play the piano. As for that song, I can guarantee you won't find sheet music for it. Your best bet is to just sound it out. The beginning melody is Gb-F-Gb-F-Bb-Ab-Bb-Db-Gb-F-Gb-F-GbThat should get you started