Impromptu
A piano piece meant to sound improvised on the spur of the moment, though usually in a clear form such as A B A. Schubert and Chopin wrote sets of them.
Source: Impromptu (Wikipedia)
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SchubertFour Impromptus, D. 935SchubertImpromptu No. 1 in C minor, D. 899/1; Op. 90 No. 1SchubertImpromptu No. 2 in E-flat major, D. 899/2; Op. 90 No. 2SchubertImpromptu No. 3 in G-flat major, D 899 / Op. 90 No. 3SchubertImpromptu No. 4 in A-flat major, D. 899/4; Op. 90 No. 4
ChopinFantaisie-Impromptu in C-sharp minor, Op. 66ChopinImpromptu No. 1 in A-flat major, Op. 29ChopinImpromptu No. 2 in F-sharp major, Op. 36