Études: in C major, Op. 10 No. 1 — in A minor, Op. 10 No. 2 — in E major, Op. 10 No. 3 — in C# minor, Op. 10 No. 4 — in Gb major, Op. 10 No. 5 — in Eb minor, Op. 10 No. 6 — in C major, Op. 10 No. 7 — in F major, Op. 10 No. 8 — in F minor, Op. 10 No. 9 — in Ab major, Op. 10 No. 10 — in Eb major, Op. 10 No. 11 — in C minor, Op. 10 No. 12 — in Ab major, Op. 25 No. 1 — in F minor, Op. 25 No. 2 — in F major, Op. 25 No. 3 — in A minor, Op. 25 No. 4 — in E minor, Op. 25 No. 5 — in G# minor, Op. 25 No. 6 — in C# minor, Op. 25 No. 7 — in Db major, Op. 25 No. 8