Gloria in C major, K. 323a (fragment)
by Wolfgang Amadeus Mozart
Mozart’s Gloria in C major (K. 323a) is a short, unfinished setting of the Mass Ordinary, transmitted as a fragment and linked in catalogues to the Kyrie in C, K. 323. Though often associated with Salzburg practice, its surviving autograph leaves its precise liturgical occasion uncertain.
Background and Context
The Gloria in C major, K. 323a survives only in a very brief, uncompleted score and is catalogued among Mozart’s individual Mass movements rather than as part of a complete Mass setting.[1] The autograph is described in the Mozarteum catalogue as a short score fragment (two leaves, with three written pages), and later transmission includes a nineteenth-century copy identifying it explicitly as the “beginning of a Gloria” by Mozart.[1]
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Because the source preserves only an opening stretch, the work’s relationship to the similarly isolated Kyrie in C, K. 323—frequently mentioned “in conjunction” with K. 323a in reference lists—remains best understood as a practical association of fragments rather than proof of a fully planned, unified Mass.[2]
Musical Character
What can be said securely comes from the scoring Mozart wrote down. The fragment is in C major and calls for SATB choir with strings (two violins and viola) plus basso continuo/organ; the Mozarteum catalogue also lists four additional parts transmitted separately in the source tradition (labelled sDes1–4), alongside the standard choral and string disposition.[1]
Even in its incomplete state, the conception suggests a festive, “cathedral” sort of opening: a bright C-major framework, choral writing supported by active strings, and an organ/continuo foundation that anchors the harmony while reinforcing the liturgical function. Yet the fragment breaks off before Mozart can articulate the larger Gloria design—whether as a compact Salzburg-style continuum or as a more segmented, concerted layout—so its formal ambitions must remain an open question.
[1] Internationale Stiftung Mozarteum (KV Online): entry for KV 323a, including status (fragment), dating range, sources, key, and instrumentation.
[2] Wikipedia: List of compositions by Wolfgang Amadeus Mozart (includes K. 323a as “Gloria in C (in conjunction with K. 323)”).