Schubert's Op. 90 contains four impromptus, D. 899 — some of the most beloved short-form piano works ever written.

The set of four impromptus, D. 899, was composed in 1827 — Schubert’s final year. Each one is a perfectly contained emotional world, from the famous opening C minor theme to the lyrical G-flat major second impromptu. They remain the gold standard for the genre he essentially defined.