Chordelia helps music students master the skill of identifying chords, with a visually engaging setting and pleasant feedback for correct answers. There are nine levels of difficulty, beginning with simple major and minor three note chords in root position, then at the middle levels adding inversions, diminished and augmented chords, and at the highest level adding 7th chords and open position chords. Students choose their level, and when they have mastered that level they move to the next. Each level includes review of lower levels, but builds the new skills required at the chosen level.