Theme in B-flat (fragment), K. 698
by Wolfgang Amadeus Mozart
Mozart’s Theme in B♭ (fragment), K. 698 is a brief surviving keyboard sketch from 1785, preserving only a single melodic idea in B♭ major. Though slight in scale, it belongs to the same Viennese period in which Mozart—aged 29—was refining a distinctly vocal, cantabile approach to piano writing.
What Is Known
Only a short piano theme survives of Mozart’s Theme in B♭ (fragment), K. 698, dated to 1785; neither an exact place of composition nor any connection to a larger completed work is securely documented in widely available reference sources.[1] In 1785 Mozart was living in Vienna, at the height of his concert career and in the midst of the great piano concertos of the mid-1780s—a context that makes even a small keyboard idea like this suggestive of his daily compositional practice.[2]
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Musical Content
K. 698 appears to consist of a single, self-contained theme for solo keyboard in B♭ major rather than a fully worked-out movement: a melodic outline with its immediate harmonic implications, without the continuation one would expect in a complete piano piece.[1] Heard in that light, the fragment reads less as a miniature “character piece” than as raw material—something like the kind of clean, singable thematic kernel Mozart might later expand into a set of variations, a rondo refrain, or a lyrical secondary idea in sonata-allegro form.
[1] Wikipedia: Köchel catalogue entry list including K. 698 (“Theme in B-flat (fragment)”), with year and age.
[2] Encyclopaedia Britannica: Wolfgang Amadeus Mozart biography (Vienna years and career context).