Impromptus, Op. 90 - Schubert

The Impromptus, Op. 90, D. 899, are a set of four impromptus for solo piano composed by Franz Schubert in 1827. They were written in the same year as the Impromptus, Op. 142, though only the first two pieces were published during Schubert's lifetime. Together with the latter set, they have become a cornerstone of the piano repertoire.

The first Impromptu in C minor blends elements of sonata, variation, and through-composed structures. The second Impromptu in E♭ major is a swift moto perpetuo with a ternary design. The third Impromptu is a flowing and meditative piece in G♭ major, characterized by long melodic lines and unbroken triadic accompaniment. The fourth and final Impromptu, in A♭ major, starts in A♭ minor and is characterized by cascading arpeggios and a chordal response.