Adagio in C major for Glass Harmonica, K. 356 (K. 617a)
von Wolfgang Amadeus Mozart
Mozart’s Adagio in C major for Glass Harmonica (K. 356, later also catalogued as K. 617a) is a brief, spellbinding late work from Vienna (1791), written for an instrument whose ethereal sound seemed almost to suspend musical time. Often heard today in piano transcription, it offers a rare glimpse of Mozart’s late style applied to a delicately sustained, singing tone—poised between private reverie and public novelty.
Background and Context
In 1791—his final year—Wolfgang Amadeus Mozart (1756–1791) was composing at astonishing speed across genres: Die Zauberflöte, La clemenza di Tito, the Clarinet Concerto, and the Requiem all belong to this same crowded horizon. Within that landscape, the Adagio in C major (K. 356/617a) stands apart as a miniature written for a fashionable “specialty” instrument, the glass harmonica (Glasharmonika), whose soft, friction-born resonance could sustain long lines in a way keyboard instruments generally could not.[1]
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The immediate stimulus was almost certainly the presence in Vienna of the blind virtuosa Marianne Kirchgessner (1769–1808), who inspired Mozart’s better-documented chamber work for the same instrument, Adagio and Rondo, K. 617.[2] Even in its modest scale, K. 356 suggests a composer intrigued by timbre—how melody behaves when it can truly “sing” without decay—and by the expressive possibilities of hushed, floating sonority.
Composition
The piece is generally assigned to Vienna, 1791, and modern cataloguing frequently pairs its long-standing Köchel number K. 356 with the later cross-reference K. 617a, reflecting revised chronology and the proximity to K. 617.[3] Unlike the Adagio and Rondo (which Mozart dated in his own thematic catalogue on 23 May 1791), the solo Adagio does not appear in Mozart’s self-made work list—a small but telling fact that helps explain why its dating and numbering have long been less stable in reference literature.[4]
For performers and listeners today, that documentary silence is partly offset by the work’s unmistakably late-Mozart profile: a concentrated lyricism, harmonies that gently intensify rather than “argue,” and a sense of expressive directness that does not require large forms to make its point.
Form and Musical Character
K. 356 is a single Adagio—a “slow piece” in the most literal, vocal sense. Its interest lies less in thematic contrast than in sustained cantabile (songful) writing and carefully shaded harmonic pacing. On the glass harmonica, the long-breathed melody can be spun almost like an operatic aria without words; on the piano, performers must work to simulate that legato through touch, voicing, and pedaling.
Several traits make the piece distinctive within Mozart’s late keyboard-oriented output:
- Timbre as form. The glass harmonica’s continuous tone turns what might otherwise be a simple lyrical paragraph into a study in color and resonance—an effect that explains why the work continues to attract arrangements, even as the original instrument remains rare.[3]
- Late-style intimacy. Rather than theatrical display, the piece favors inward expression: a calm surface animated by subtle harmonic inflections and expressive suspensions (dissonances that resolve gently).
- A miniature that rewards close listening. Its apparent simplicity can disguise a remarkable control of phrase length and cadence—Mozart’s ability, late in life, to make a handful of bars feel inevitable.
In short, K. 356 deserves attention not as a curiosity for an odd instrument, but as a concentrated example of Mozart’s late lyric gift—music that achieves depth through restraint.
Reception and Legacy
Historically, K. 356 has lived a double life. On one hand, it belongs to the small corpus of significant classical-era works for glass harmonica, an instrument associated with both salon fashion and an almost uncanny sonic aura.[1] On the other, it has been absorbed into keyboard culture through transcription, often appearing in “piano pieces” anthologies precisely because its melodic line adapts persuasively to the piano’s singing register.
Modern scholarship and editions commonly present it under the paired designation K. 356 (K. 617a), acknowledging both tradition and revised chronology.[4] In performance, it often serves as a quiet counterpart to the more extroverted K. 617: where the quintet can charm as concert entertainment, the solo Adagio can feel like a private nocturne avant la lettre—a late-Vienna whisper that still carries, even when played on a modern piano.
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Noten
Noten für Adagio in C major for Glass Harmonica, K. 356 (K. 617a) herunterladen und ausdrucken von Virtual Sheet Music®.
[1] Encyclopaedia Britannica — overview noting Mozart’s Adagio for glass harmonica (K. 356) and its 1791 performance context.
[2] Wikipedia — Marianne Kirchgessner biography, linking Mozart’s glass-harmonica works (K. 617 and the solo Adagio K. 356/617a) to her Vienna activity.
[3] IMSLP — work page for Adagio in C major, K. 356/617a (cataloguing, year, and instrument).
[4] Digital Mozart Edition / Neue Mozart-Ausgabe PDF — editorial notes on KV 356 (617a), including the absence of an entry in Mozart’s own thematic catalogue and modern catalogue cross-referencing.