Divertimento No. 9 in B♭ major (K. 240)
de Wolfgang Amadeus Mozart
Mozart’s Divertimento No. 9 in B♭ major, K. 240 is a compact yet characterful Salzburg wind work, completed in January 1776, when the composer was 20. Scored for six instruments (two each of oboes, horns, and bassoons), it shows Mozart treating a courtly “background” genre with strikingly alert conversation, rhythmic wit, and a sure sense of classical proportion.[1]
Background and Context
In Mozart’s Salzburg years, wind divertimenti and serenaden were not primarily “concert works” in the modern sense. They belonged to a lively Central European tradition of outdoor and indoor wind music, often tied to dinners, evening entertainments, and courtly celebrations—music expected to charm, accompany, and dignify without demanding concentrated listening.[1] Yet Mozart repeatedly uses the occasion genre as a laboratory: how much can be achieved with a handful of timbres, short forms, and an audience that may not be sitting in reverent silence?
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K. 240 sits at an especially interesting point in his development. In 1776 Mozart was deeply embedded in Salzburg’s musical economy, writing abundantly across genres while also refining the crisp, theatrically minded style that would later animate his Viennese masterpieces. The wind sextet medium (pairs of oboes, horns, bassoons) is modest compared with the grander “Harmonie” serenades of the 1780s, but it already encourages a kind of instrumental dialogue that is more like chamber music than mere functional accompaniment.
What makes K. 240 worth renewed attention is its balance of practicality and invention. Within four concise movements, Mozart varies texture and role: bassoons do not merely reinforce the bass line, horns color the harmony and articulate cadences, and the oboes carry melodic profiles that are economical but distinctive. The result is a divertimento that can work as convivial table music—and still rewards close listening.
Composition and Premiere
The Divertimento in B♭ major, K. 240 is securely transmitted as an authentic, complete work, with an autograph source dated “nel Gianaro 1776” (January 1776).[1] The Köchel-Verzeichnis places it in Salzburg and dates it specifically to January 1776.[1] Modern reference catalogues and score repositories likewise associate the piece with January 1776.[2]
Like many Salzburg wind divertimenti, the circumstances of the first performance are not firmly documented in surviving records; it was likely written for the courtly and civic occasions in which such ensembles flourished. The work was published only later (early 19th century), which also helps explain why it has never achieved the public profile of Mozart’s later Viennese wind serenades.[2]
Instrumentation
Mozart scores K. 240 for a classic Salzburg wind sextet:[1]
- Winds: 2 oboes, 2 bassoons
- Brass: 2 horns
This combination is deceptively rich. The two oboes offer brilliance and vocal clarity; the bassoons provide both bass support and agile inner-voice motion; and the horns—using the natural harmonic series—supply a gleaming halo at cadences, reinforce the tonic/dominant pillars, and thicken the sonority in tuttis. In performance, the scoring works best when treated as true chamber music: balances must allow bassoons’ counter-lines and the horns’ punctuating calls to register as structural events, not mere background color.
Form and Musical Character
K. 240 is in four movements, a layout that keeps the entertainment ethos while remaining close to symphonic logic (fast–slow–dance–fast):[2]
- I. Allegro
- II. Andante grazioso
- III. Menuetto – Trio
- IV. Allegro
I. Allegro
The opening movement immediately signals that Mozart is not content with mere pleasantness. The material is bright and public-facing (B♭ major suits outdoor wind sound particularly well), but the interest lies in how quickly themes are passed around the ensemble. Instead of a simple “melody plus accompaniment,” Mozart builds a conversational texture: oboes may lead, but bassoons frequently animate the harmony with active motion, and horns articulate the music’s architectural joints.
II. Andante grazioso
The designation grazioso (“graceful”) is telling. This slow movement is not tragic or operatically intense; rather, it cultivates poise, transparency, and a kind of courtly intimacy. In wind writing, sustaining long lines without heaviness is a compositional challenge, and Mozart answers with light scoring, clear phrase symmetry, and gentle harmonic turns that feel more like elegant speech than rhetorical declamation.
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III. Menuetto – Trio
The minuet places K. 240 firmly in the social world of the divertimento. Yet even here Mozart avoids uniformity: the minuet proper has a sturdy, public gait, while the trio typically lightens texture and rebalances the ensemble so that the ear hears the same group anew. The effect is theatrical in miniature—one room, the same six players, but a shift of “lighting” and character.
IV. Allegro
The finale restores extrovert momentum. Rather than ending with a mere burst of noise, Mozart aims for crisp articulation and clear cadential design—qualities that help outdoor or dinner music “carry” in real spaces. For the attentive listener, the movement’s pleasure lies in its economy: short motives are enough, provided they are distributed with timing, contrast, and a strong sense of arrival.
Reception and Legacy
K. 240 remains less famous than Mozart’s later wind serenades—above all the Gran Partita, K. 361/370a, and the Viennese serenades K. 375 and K. 388/384a—partly because it is smaller in scale and more closely tied to Salzburg’s functional music-making. But that very modesty is its historical value. It documents Mozart, at 20, mastering a practical court genre with the same compositional intelligence he brought to “higher” forms.
For modern performers and listeners, the divertimento also offers a compelling bridge between background entertainment and concert repertoire. Played with alert articulation and genuine chamber interplay, K. 240 reveals a distinctive Mozartian gift: the ability to make social music feel like drama without words—music that can politely inhabit the margins of an occasion, yet step into the foreground the moment one decides to listen closely.[1][2]
[1] International Mozarteum Foundation (Köchel-Verzeichnis): work entry for KV 240 (dating, authenticity, Salzburg context, instrumentation, sources including autograph).
[2] IMSLP: Divertimento in B-flat major, K. 240 — general information (movements, key, instrumentation, composition date; publication notes).