Chord Progressions on Piano (ja)

Understanding and playing the most important chord progressions: I-IV-V-I, ii-V-I, pop progressions, and how to transpose them to any key.

Chord Inversion Recognition (ja)

Distinguishing between root position, first inversion, and second inversion chords by ear — the subtle differences that shape harmonic flow.

Harmonic Progression Recognition (ja)

Identifying chord progressions by ear: I-IV-V-I, ii-V-I, blues progressions, and how to analyze harmonic movement in real music.