Mozart’s Posthorn Serenade (Serenade No. 9 in D major, K. 320) is a renowned 1779 orchestral work composed in Salzburg, likely for university graduation ceremonies. Known for its brilliant, 7-movement structure, it earns its nickname from a prominent, limited-note solo played on a posthorn—a valveless brass instrument—in the second trio of the menuetto.
Key details about this work:
- Context: It was composed on August 3, 1779, and was one of the last large-scale orchestral serenades Mozart wrote in Salzburg.
- Instrumentation: Unusually large for the time, it includes two flutes, piccolo, two oboes, two bassoons, two horns, two trumpets, posthorn, timpani, and strings.
- Structure: The work features seven movements, characterized by a blend of festive, brilliant, and deeply emotional sections, including a dramatic D minor Andantino.
- Posthorn Use: The posthorn solo occurs in the second trio of the second menuetto, highlighting a high-pitched instrument traditionally used by postal coach guards.
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