Compositions   1876: Violin Sonata No 1 1880: Berceuse for Violin and Piano 1883: Élégie for Cello 1887: Requiem 1887: Pavane 1888: Caligula 1893: Dolly Suite for Two Pianos 1898: Pelléas et Mélisande 1920: Masques et Bergamasques 1924: String Quartet	Philosophy 1867: Marx: Das Kapital     1883: Nietzche: Thus Spake Zarathustra         1900: Russell: Principia Mathematica     1929: Heidegger: What is Philosophy?