Church Sonata No. 16 in C major (K. 328): Mozart’s Salzburg Epistle Sonata in Miniature
by Wolfgang Amadeus Mozart
Mozart’s Church Sonata in C major, K. 328 (1779) is a compact, single-movement sonata da chiesa written for the Salzburg Mass, where an organ-led instrumental piece was traditionally played between the Epistle and the Gospel.1 Though modest in scale, it offers a vivid glimpse of Mozart (aged 23) writing liturgical music that is at once functional, brilliant, and unmistakably his own.2
Background and Context
In Salzburg, Wolfgang Amadeus Mozart (1756–1791) worked within an ecclesiastical culture that prized brevity and clarity. One local custom—especially associated with Salzburg Cathedral under Archbishop Colloredo—was the so-called “Epistle Sonata”: a short instrumental movement inserted into the Mass between the Epistle and the Gospel.2 These pieces were not conceived as concert works, yet in Mozart’s hands they often become deft exercises in economy: a few minutes of lively counterpoint, orchestral sparkle, and (in several cases) a genuinely concertante organ part.2
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K. 328 belongs to the late Salzburg group of such sonatas from 1779, the year Mozart returned from Paris and Mannheim and resumed court duties at home.2 If the church sonatas rarely appear in standard histories beside the symphonies and concertos, they nevertheless sit at a revealing crossroads: liturgical need, local performance practice, and Mozart’s growing interest in the organ as a solo voice.
Composition and Liturgical Function
The Köchel-Verzeichnis (as maintained by the Internationale Stiftung Mozarteum) places K. 328 in Salzburg in 1779, within the span April–June 1779.1 Like Mozart’s other church sonatas, it was designed to be fitted into the Mass at the Epistle, essentially functioning as a brief musical “elevation” of attention before the Gospel.
Forces are deliberately compact. K. 328 is scored for organ and strings in the Salzburg “church quartet” tradition—without violas—centred on two violins and bass (cello/double bass) with the organ at the core.3 Notably, K. 328 is among the sonatas in which the organ is treated as obbligato (written-out, soloistic) rather than merely providing figured-bass accompaniment, and this immediately raises its expressive stakes: the organ becomes a protagonist, not just liturgical infrastructure.2
Musical Structure
K. 328 is a single movement marked Allegro.2 Its character is bright and forward-moving—appropriate to its C-major tonality and to the practical constraint that the liturgy could not accommodate extended instrumental contemplation. Yet within that narrow frame Mozart achieves a persuasive sense of dialogue.
The movement’s most distinctive feature is the way the organ line alternates between integrative and soloistic roles: at times reinforcing the ensemble’s harmonic direction, at others stepping out with passagework that feels close in spirit to concerto writing.2 Because the string writing is lean (and violas are absent), textures remain transparent; this clarity allows quick harmonic turns and motivic play to register immediately, even in a resonant church acoustic.
One can also hear, in miniature, Mozart’s Salzburg gift for ceremonial momentum: K. 328 does not “develop” on the scale of a symphonic movement, but it moves with confident purpose, giving the congregation a concentrated burst of instrumental rhetoric—animated, lucid, and never indulgent.
Reception and Legacy
The church sonatas fell out of use when liturgical priorities changed; after Mozart left Salzburg, the practice itself largely disappeared from local worship.2 In modern performance, K. 328 tends to live at the edges of the repertoire—often as a liturgical reconstruction, a recording complement to the Salzburg Masses, or a concert interlude that foregrounds the organ’s eighteenth-century role as both continuo and solo instrument.
K. 328 deserves attention precisely because it is not “grand”: it shows Mozart solving a real, routine problem—how to make a brief, functional Mass insertion speak with freshness. In that sense, it stands as a small but telling document of Salzburg’s church-music ecosystem in 1779, and of Mozart’s ability to turn even institutional constraint into poised musical speech.12
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[1] Köchel-Verzeichnis (Mozarteum) work entry for KV 328: dating, place, catalogue metadata.
[2] Wikipedia overview article on Mozart’s Church Sonatas: liturgical placement (Epistle Sonata), organ obbligato vs continuo, and basic work list including K. 328.
[3] IMSLP work page for Church Sonata in C major, K. 328/317c: scoring/parts availability reflecting the standard Salzburg church-quartet forces with organ.