Easy to advanced graduated music theory exercises with instant feedback immediate scoring and self testing: scales intervals chords cadences secondary dominants borrowed chordss and pop chords in real books. Easy to advanced. There are 84 scale chord and interval spelling files.The Help file is a complete music theory book.Teach yourself all scales intervals triads to 13th chords cadences borrowed chords secondary dominants and pop chords in real books.Answer questions by clicking the screen keyboard. See your answer notated and played as you answer. Questions in each exercise are presented in random order for repeated practice. Peek at the correct answer go to the next question or repeat previous questions at any time.