Gr. I think I hate you.
With such a long code, it's almost impossible to not mess it up for one, making it hard to tell if I'm even entering the right code. This leaves very little room for trying to figure out what the code is supposed to be, even following your directions I can't get it to open because the sequence keeps on getting messed up. Also, you're being detrimental to the people who read music (like yourself,) by putting the notes in the wrong place. You have a good concept by doing these things, but by putting it all together, it ends up being an exercise in futility.
Also, sometimes the notes will double click, leaving you with no clue if you're entering it right or not, especially with the lack of sound to alert you. This is definitely a good start, I was excited to see a piano as part of the puzzle, but I'm beyond annoyed. Boo to this.