Sheet music player

1

I have developed a fairly simple swf that will play and simultaniously show the sheet music I am hoping to sell on my (future) website. However, I just ran across a really slick sheet music player (you can pick a tune that the player will load at http://www.mediarain.com/musicrain/demo.php). Has anyone seen or heard about something similar in the flash world? Flash would be the ideal program for something like this! Thanks