As for the Topic of the Day...
Rameau: Gavotte et Cinq Doubles
Debussy: "La plue que lente", "Images", the Preludes, the Etudes (and the rest of the piano music) and almost all of the mélodies
Fauré: "Cantique de Jean Racine", the Violin Sonata, the two Piano Quartets, and almost all of the mélodies especially "Notre amour", "Les rose d'Ispahan", "Les Berceaux", "La Bonne Chanson", and those amazing duets: "Puisqu'ici-bas", "Tarantelle" and "Pleurs d'or"
Poulenc: "Ç" - a truly haunting song, the instrumental Sonates especially the ones for flute and oboe, the Concerto for Two Pianos
Milhaud: "Scaramouche" for two pianos - So much fun to play!
Saint-Saens: "Carnivale des Animaux", and some of his mélodies are also quite beautiful.
Ravel: "Don Quichotte á Dulcinée", both Piano Concertos, "Miroirs"
Other art-song composers/specialists: Hahn, Duparc, Bachelet, Satie, etc., etc., etc.