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Complete Sonatas, Volume IV composed by CPE BachEdited by Ulrich Leisinger for Flute and Basso continuo (or Piano)Includes 2 copies of the Flute/Basso continuo score and one piano/flute score.According to the Catalogue of CPE Bach's Estate, the two works in this volume were composed in Berlin in 1740 and 1747 respectively. Although the two compositions are listed as separate works in all thematic catalogues so far, they are rather two versions of the same piece. It is known that CPE Bach often revised his earlier compositions. In this case, the inner movements are largely identical, whereas the last movement of Wq131 is based on a theme already used in Bach's sonata for viola de gamba and basso continuo in C major (Wq136/H.558; 1745), and the first movement of Wq129 was replaced by a more modern movement type. Although substantial, the changes do not go beyond other revisions that CPE Bach undertook with his early works. It remains, however, unclear whether or not Bach regarded both versions as legitimate alternatives or whether he intended to replace Wq129 with the later version Wq131 and this fact was simply overlooked at the time when the catalogue of his estate was prepared.Contents:Sonata in D Major (Wq129/H.556)Sonata in D Major (Wq131/H.561)