This could be a SUCH a handy away-from-piano practice tool for the serious student. But there are gross mistakes: the misspelling of chords and scales as mentioned, but also what I see as just wrong scales (i.e., their "diminished whole tone" for playing with dom#9 chords has Maj7--I think its supposed to be the Dim Half/Whole-tone scale). Also, important and current scales and chords are not present: no locrian#2, no Altered Scale, pentatonics, etc. and no Alt13 chords. Please update this potentially GREAT practice resource. Or maybe make it editable?? So that the user can add chords/scales that are at the top of their practice "to do" list.