Valse op.64 no.2 by Chopin

Yes. I had a piano tuned to A-flat major. I purchased an old piano with old rusty strings. The piano tuner was afraid that if he tuned the piano to a 440 A that the strings would break. So instead he tuned the A Sharp to 440. As a result the A was tuned to A flat.

Eventually, I replaced the strings and another tuner pulled the strings up so that the A was 440. He did it gradually.

The Waltz in D Flat Major, known as the Minute Waltz, also Valse du petit Chien is a waltz for solo piano by Frederic Chopin composed in 1847

Schubert : Impromptu, Op. 90 D899, No. 3 in G flat major

Schubert's music is heavily influenced by Beethoven. He used Beethoven's compositions as harmonic models for his compositions. For examples, his Impromptu in A flat (Op 142/2) is a pure reminiscent of Beethoven's Piano Sonata in A flat major (Op 26).