You make a good point about replacing "tap" with "click," but while the two seem similar conceptually (ie. either way you get "input --> reaction"), I think the

You make a good point about replacing "tap" with "click," but while the two seem similar conceptually (ie. either way you get "input --> reaction"), I think the actual experience is completely different. With clicking, you make an input and see a reaction elsewhere (on the screen). But with tapping, the input and reaction occur in the same place. And I think that direct connection is key. Playing music is by nature a tactile experience, so composing in a tactile manner brings you that much closer to the end product. Granted, I'm a musician myself, so I could be biased. But I think pretty much anyone can enjoy the idea of adding notes to a staff and seeing music come out the other end. The more direct that process is, the better. In terms of precision, I find the iPad to be plenty accurate, for these purposes anyway. The staff would have to be blown up a bit, but after that I don't see note accuracy being a problem. Plus, this would probably be a more limited program and wouldn't be as applicable to professionals who need that pixel-by-pixel level of accuracy (think finger painting vs. photoshop...).