There is a lot of variety in Debussy’s piano music.　Some of it is very difficult to play, e.g. the "Études" and pieces such as "L’isle joyeuse" ("The happy island"). Other collections are much simpler, e.g. "Suite bergamasque" which includes the very popular piece called "Clair de lune" ("Moonlight"). He wrote two books of preludes. Each of the pieces has a title, but the titles are printed at the end of each piece, as if he did not want the listener to know what it was about until afterwards.