Summary of applications:
01. Intervals.
02. Major and minor Scales (natural, harmonic and melodic).
03. Key Signatures.
04. Map of the keys: Cycle of Fifths, Bartók’s Axes and Coltrane Changes.
05. Simple graphical representation of 3 and 4 note chords (triads and seventh chords). Finding their Arpeggios.
06. Chord finder: Chords associated to any major or minor scale (natural, harmonic and melodic).
07. Pentatonic, diminished and hexatonic scales.
08. Modulation. And more…

The Harmonic Wheel is a new representation of Sounds, where the Consonance Relationships among them are clearly shown. It is, therefore, a powerful tool for the comprehension of Music Theory and Harmony. It consists of two rotating discs, one being card and the other plastic.