String Quartet No. 5 in F major, K. 158 (“Milanese”)
von Wolfgang Amadeus Mozart
Mozart’s String Quartet No. 5 in F major (K. 158) belongs to the so‑called “Milanese” set (K. 155–160), composed in northern Italy in late 1772 and early 1773 when the composer was only 17. Written during the Mozarts’ Milan visit, it balances Italianate melodic ease with an early taste for surprise—most tellingly in its poised F‑major frame and a striking minor‑mode slow movement.
Background and Context
In the early 1770s, Wolfgang Amadeus Mozart (1756–1791) was still, in professional terms, a travelling composer: his career advanced through journeys, commissions, and performances that Leopold Mozart carefully managed. The six quartets K. 155–160 are inseparable from this “Italian” phase. They were written during the Mozarts’ travels in northern Italy—associated especially with Milan—and are commonly gathered under the modern label “Milanese Quartets.”[1]
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Historically, these pieces stand at a revealing crossroads. On the one hand, the string quartet as a genre was still consolidating its identity in the wake of early Classical chamber styles (divertimento-like textures, first-violin prominence, light accompaniment figures). On the other, Mozart was rapidly approaching the more concentrated quartet craft that would soon absorb Joseph Haydn’s innovations in Vienna later in 1773.[2] K. 158 is therefore not “late Mozart” in the familiar sense; it is, instead, a document of how quickly he learned to make four string instruments converse with clarity and character.
Composition and Dedication
String Quartet No. 5 in F major is catalogued as K. 158 and is generally dated to early 1773, during the Milan period that also encompasses the rest of the K. 155–160 set.[1] In the Köchel Verzeichnis maintained by the Internationale Stiftung Mozarteum, the work is listed as a quartet in F for two violins, viola, and basso (i.e., the standard four-part string disposition).[3]
No dedicatee is firmly attached to K. 158 in the way later quartets might be linked to specific patrons or circles. That relative anonymity is itself typical of the set: these are functional, travel-era chamber works—likely intended for performance in cultivated private settings during the Italian sojourn—yet crafted with enough individuality to reward close listening.
Form and Musical Character
K. 158 is scored for the standard quartet ensemble:
- Strings: violin I, violin II, viola, violoncello
Unlike Mozart’s mature quartets (where four movements become normative), K. 158 follows the three-movement plan prevalent in much Italian instrumental music of the day:[1]
- I. Allegro (F major)
- II. Andante un poco allegretto (A minor)
- III. Tempo di Menuetto (with Trio in F minor)
This layout already hints at the quartet’s distinctive profile: a sunny major-mode opening balanced by an introspective minor slow movement, and a concluding minuet whose Trio again turns to the minor. The Milanese set is notable for this kind of expressive “shadowing”—several of the quartets place a middle movement in the minor mode—and K. 158 is a particularly concentrated example.[1]
I. Allegro
The first movement projects an outwardly fluent, Italianate Allegro: clear phrase symmetry, bright F‑major sonorities, and a texture that often allows the first violin to sing while inner voices supply rhythmic buoyancy. Yet it would be a mistake to hear it as merely “easy” music. Even within this galant surface, Mozart shows a youthful appetite for rhetorical play—cadential feints, quick shifts of register, and little timing-games in the entrance and overlap of parts—that enliven what might otherwise sound like polite conversation.
II. Andante un poco allegretto (A minor)
The slow movement is the quartet’s emotional center: an Andante un poco allegretto in A minor, a key choice that immediately darkens the palette (the relative minor of the home key’s dominant). The melodic writing here is more inward, and the ensemble feels less like solo-with-accompaniment and more like a shared meditation—an early sign of Mozart’s growing interest in chamber music as a venue for character and contrast, not only charm.
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III. Tempo di Menuetto (Trio in F minor)
Ending with a Tempo di Menuetto rather than a fast finale is characteristic of the Milanese group, and it gives K. 158 a subtly old-fashioned grace.[1] The minuet’s courtly exterior, however, is complicated by the Trio’s turn to F minor: a shadow version of the home key that momentarily transforms the dance into something more searching. This major/minor pairing at the close is one reason the quartet deserves attention: within a seemingly modest form, Mozart engineers an expressive arc that begins in ease and ends with a glance toward seriousness.
Reception and Legacy
K. 158 has never occupied the repertory position of the “Haydn” Quartets (K. 387, 421, 428, 458, 464, 465), yet its value is precisely historical and stylistic: it shows Mozart learning to write idiomatically for four strings while testing how much contrast can be housed inside compact, entertainment-oriented designs. The New Mozart Edition places K. 158 within the early quartet corpus, underscoring how quickly Mozart’s quartet writing would develop once Haydn’s model became unavoidable later in 1773.[2]
Today, listeners often come to K. 158 through complete-quartet cycles and recordings of the Milanese group, where it can sound like a “light” entry—until the A‑minor slow movement and the F‑minor Trio reveal a teenager already alert to the dramatic potential of key, timbre, and dialogue. Heard on its own terms, this quartet is a compact study in youthful Classicism: graceful, yes, but with a carefully placed undertow that points forward to Mozart’s later, deeper chamber conversations.
[1] Wikipedia: overview of the Milanese Quartets (K. 155–160), dating (late 1772–early 1773) and movement/key notes relevant to K. 158.
[2] Digitale Mozart-Edition (Mozarteum): New Mozart Edition (NMA) foreword PDF for the string quartets (context for early quartets and development).
[3] Köchel Verzeichnis (Internationale Stiftung Mozarteum): work entry for K. 158 (quartet in F for 2 violins, viola and basso).