Impromptu Op 90 No 4 in A-Flat Major is the fourth piece of a series of eight for solo piano composed in 1827 by Franz Schubert. They were published in two sets of four impromptus each: the first two pieces in the first set were published in the composer’s lifetime as Op. 90; the second set was published posthumously as Op. 142 in 1839 (with a dedication added by the publisher to Franz Liszt).
Schubert by Sokolov
Op 90 No. 2
Impromptu Op. 90 No. 2 in E-Flat Major