Etude in C-sharp minor op. 25-7 Etude in C sharp minor op.25 no.7 Etude in D-sharp minor op.8-12 Prelude in C-sharp minor op. 3-2 Etude in G sharp minor op. 25 no. 6 Etude in C sharp minor op. 2 no. 1 Etude in G sharp minor op.25 no.6 Prelude in C sharp minor op. 45 Prelude in c sharp minor op.45 Etude in C sharp minor, op. 2 No. 1