- Köchel Number
- K9 626b/55 | K6
- Genre
- Supplement
- Form
- Supplement
Listed in the ninth Köchel catalogue as “Autograph musical manuscript” (lost), K. 626b/55 is a purely archival entry: an autograph once reported, but now missing, with no surviving musical text to identify its genre, scoring, key, date, or even secure authorship [1]. In practical terms, it is a doubtful—or possibly spurious—item that cannot be performed or assessed as a composition.
What Is Known
K. 626b/55 is described only as an autograph musical manuscript, and it is explicitly marked lost in modern catalogue summaries [1]. No incipit (opening bars), instrumentation, key, place of origin, or date is transmitted with the entry, and no surviving source has been identified in public-facing catalogues. As a result, the attribution to Wolfgang Amadeus Mozart (1756–1791) remains untestable: without the document itself (or a copy, description, or musical excerpt), it is impossible to distinguish a lost Mozart draft from a misattributed autograph, a later forgery, or a cataloguing echo of a now-untraceable report.
Musical Content
No musical content survives, and nothing reliable is known about what was written on the lost leaf or leaves. Consequently, K. 626b/55 cannot be analysed, edited, or performed, and it cannot be meaningfully placed within Mozart’s stylistic development on musical grounds [1].
Sources
[1] Wikipedia — Köchel catalogue table entry listing “626b/55” as “Autograph musical manuscript” (lost).