Well trodden ground? Except there wasn't desktop software that could do this beforehand.

If you can't see the innovation, let me spell it out for you in very few words: the software has an intuitive-enough UI that you need no prior knowledge of the program to use it, and you can share musical ideas in one or two clicks. Please tell us exactly which desktop program allowed you to do this, as easily, pre-2012? Yes, this is novel, since it enables something that wasn't possible before.