French music

The jeu de tierce is a combination of stops indicated in French organ music of the 17th and 18th centuries. It consists of the bourdon, flûte, nazard, quarte, tierce, and sometimes the larigot stops. This means that for any given note played on the keyboard, the organ sounds the following pitches: the note itself, the octave, the 12th, the 15th, the 17th, and sometimes the 19th. These notes reinforce the harmonic series, creating a solo combination usually played against an accompaniment of softer stops.