The idea is fantastic and very original.
I wish there was some indication/option to reset selection, because once you start it's impossible to know at which stage you are, what was already picked and what wasn't.
I liked that there was so many different things to "sort", but pitch was really difficult for me, mostly because I don't have very good ear for stuff like this. I think that if it was a note rather than a click it might've been a bit easier? I don't know :)