Saint-Saëns was responsible for the renaissance of chamber music in France, paving the way for Fauré, Debussy and Ravel. Appreciated since its creation, his Opus 18 was particularly favored by the famous Cortot-Thibaud-Casals Trio. Conquered by its qualities of balance as well as its melodic clarity, Ravel took it as a model before composing 50 years later a masterpiece, almost without equal in the 20th century. A true meteor, Lili Boulanger left, shortly before her death at the age of 24, two intimate and audacious pieces, testifying to an authentic harmonic genius.