The harmonic ear is the first work of the trilogy Harmonie - Improvisation - Composition This manual is a practical and active presentation of musical learning by tonal harmony. Like a toolbox, it is a first step for any analysis process (agreements degrees - cadences) Works of the repertoire are illustrated both on score and on original graphic diagrams with CD. Thread of the trilogy, The harmonic ear is the toolbox of the analysis. Improvisation - Instructions for use, gateway to creation. The composition, the musical idea meeting the pen.