D-flat major
For example, Chopin's Prelude No. 15 in D-flat major ("Raindrop"), modulates from D-flat major to C-sharp minor for the middle section in the parallel minor, and in his Fantaisie-Impromptu, primarily in C-sharp minor, Chopin switches to D-flat major for the middle section for the opposite reason. Claude Debussy also switches from D-flat major to C-sharp minor in the significant section in his famous Clair de lune. Antonín Dvořák's New World Symphony likewise switches to C-sharp minor for a while for the significant section in the slow movement.