Too big

There is the term "bigger is better" and it unfortunately doesn't apply to this. The tutorials are larger than it should be, and you should be able to see all of them while being able to play on your flash keyboard.
Piano sounds are nice, but it can't help for better sound quality.
You should also include more labels on your piano, like all of the sharps and flats, because, for example, in Panthera's Cowboys From Hell, there is an A sharp. For inexperienced musicians, they probably do not know that it is equal to B flat.

it is basically a good idea, but you can't use it

i wish you could be actually able to play it, which you can't, since it's too big. demos would also be nice

Dude I love your piano sounds

One problem I can't scroll down and touch the keys because of the scroll bar.
Maybe if you can make it smaller try putting buttons to make the song list so it does not have to be all clutter and big not to see the keys I hope you get ideas from friends and other members who can help you organize your piano music it will help people play easily and more enjoyable I hope you improve some people will like you more about your work :D

ehh

i cant see the note s

couldn't get to the keyboard

I couldn't get to the keyboard and "The Final Countdown" was wrong.