Frédéric Chopin's Impromptu No. 1 in A♭ major, Op. 29, was composed in 1837.[1]
The impromptu is in ternary form (ABA), the middle being in the key of F minor.[2] A perpetuum mobile in triplets accompanies the piece.
In George du Maurier's novel Trilby, the title character, a singer who can perform only under the influence of hypnosis, performs the Impromptu in A♭ major as a wordless vocalise to end her concerts.
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