- Köchel Number
- K9 Anh.C 27.03 | K6 Anh. C 27.03
- Genre
- Piano Music
- Form
- Piano Pieces
- Key
- G Minor
- Date
- c. 1787
- Age
- 31
The Fantasia in G minor (K. Anh. C 27.03, sometimes also cited as K. 528a) is a short, three-page keyboard fragment traditionally dated to 1787, but transmitted with uncertain provenance and doubtful attribution to Wolfgang Amadeus Mozart (1756–1791) [1]. Scored for organ in modern cataloging, it reads like the written trace of an improvisatory moment rather than a fully “composed” fantasia in the concert sense [2].
What Is Known
The work circulates as Fantasia in G minor for organ, dated 1787, and is commonly cataloged as K. 528a / K. Anh. C 27.03 [1]. Its modern presentation derives from the Neue Mozart-Ausgabe (edited by Wolfgang Plath), where it appears among “single pieces” for keyboard [1]. A heading in the NMA print (as reproduced in the preview image) associates it—cautiously—with an organ improvisation at Strahov Monastery in “Autumn 1787” (entstanden angeblich…) [2]. Beyond that note, the surviving documentation is thin, and the attribution remains questionable.
Musical Content
On the page, the music is cast on two staves in common time (C), with a G-minor key signature (two flats) and frequent tr (trill) marks over decorative upper-voice figures [2]. The texture suggests an improvisatory idiom: short gestures rather than a clearly articulated large-scale form, with the right hand lingering around a melodic upper register while the left hand supplies relatively sparse harmonic support. Notably, the writing favors quick ornamental turns and cadential-like flourishes—effects that sit naturally under the hands at a keyboard and would project clearly on an organ with a singing principal stop.