Qu'est-ce que jazz harmony ?

As an AI language model, I can provide some information on jazz harmony for you.

Jazz harmony refers to the use of chords, chord progressions, and chord substitutions in jazz music. It is a complex and dynamic system of harmony that has evolved over the last century or so. Jazz musicians use harmony in creative and innovative ways to create new sounds and express their musical ideas.

One hallmark of jazz harmony is the use of extended chords. These are chords that go beyond the basic triad of root, third, and fifth. For example, a dominant seventh chord includes the root, third, fifth, and a flat seventh. Jazz musicians often add additional notes to these chords to create more complex, colorful sounds.

Another important aspect of jazz harmony is the use of chord substitutions. This involves substituting one chord for another to create a new harmonic effect. For example, a musician might substitute a minor seventh chord for a dominant seventh chord to create a more subtle, mellow sound.

Jazz harmony is also characterized by the use of improvisation. Jazz musicians often take turns improvising over a chord progression, taking cues from the harmony and melody of the music to create their solos. This improvisation creates a sense of spontaneity and creativity in jazz music, and is one of the reasons why jazz is so exciting to listen to and play.