Guillaume-Gabriel Nivers

Guillaume-Gabriel Nivers was a French organist, composer and theorist. His first livre d’orgue is the earliest surviving published collection with traditional French organ school forms. Nivers’s other music is less known; however, his treatises on Gregorian chant and basso continuo are still considered important sources on 17th century liturgical music and performance practice.

Adapted from the Wikipedia article on Guillaume-Gabriel Nivers.