I like it. One possible bug (or maybe I misunderstand the UI): if the note that I pick at the top is C#, and then I select Aeolian in the Scale/Mode selector,

I like it. One possible bug (or maybe I misunderstand the UI): if the note that I pick at the top is C#, and then I select Aeolian in the Scale/Mode selector, shouldn't the label say "C# Minor"? Right now it just says "C Minor".