For me, the hard part of notating music is getting the timing right. I do that my making a guess, entering it on Noteworthy Composer, and telling Noteworthy to play it back. If it sounds right, I've done it. If not, I try some other timing.

I'm sure many people have the same problem.

I watched the video for a while, and it's visually impressive. But does the app play the music back? If it does, then it is indeed way cool.