Piano Sonata in B♭ major, K. 498a (Spurious/Doubtful)
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The so-called Piano Sonata in B♭ major (K. 498a; 1785) is a four-movement keyboard work transmitted under Mozart’s name, but now generally regarded as spurious—most often associated with August Eberhard Müller. Surviving evidence points to a posthumous compilation assembled from disparate materials, some of them adapted from authentic Mozart works.
Background and Context
The sonata known as K. 498a is connected in modern scholarship less with Mozart’s documented keyboard output of 1785 (his Viennese “concerto year”) than with a later publishing history: it appeared in print only in 1798, issued in Leipzig under Mozart’s name, and was soon afterward linked instead to the Thomaskantor August Eberhard Müller (1767–1817) [1] [2]. The Neue Mozart-Ausgabe places the piece among works of dubious authenticity and treats it as a “mixed” text derived from early prints rather than a single authoritative source [3]. Within this contested picture, older writers occasionally singled out individual movements (notably the first and third) as possibly preserving Mozartian material, though such claims remain doubtful in current editorial framing [3].
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Musical Character
As transmitted, K. 498a presents four movements (Allegro, Andante, Menuetto, Rondo) in B♭ major [1]. Several portions are demonstrably derivative: the Andante is described as an arrangement of the variations movement from Mozart’s Piano Concerto No. 17 in B♭ major, K. 450, while the finale incorporates adapted passages associated with the finales of concertos K. 450, K. 456, and K. 595 [1]. In the NMA editors’ view, the opening movement and minuet read as original composition in a deliberately “Mozartian” idiom, the slow movement as arrangement after Mozart, and the Rondo as a kind of stylistic patchwork—one reason the work resists the organic thematic logic and tight motivic economy typical of Mozart’s securely authentic Viennese sonatas [3].
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[1] Wikipedia: overview of K. 498a (publication history; movement titles; identified borrowings from Mozart concertos).
[2] IMSLP: catalogue entry listing the sonata under August Eberhard Müller and giving K. 498a / Anh. 136 identifiers.
[3] Neue Mozart-Ausgabe (Digital Mozart Edition), Series X/29/2 (Works of Dubious Authenticity): editorial discussion of K. Appendix 136 / K. 498a as a mixed edition and likely Müller work with arranged/borrowed Mozart material.