Serenade No. 9 (Mozart)

The Serenade for Orchestra No. 9 in D major K. 320, Posthorn, was written by Wolfgang Amadeus Mozart in Salzburg, in 1779. The manuscript is dated 3 August 1779 and was intended for the University of Salzburg's "Finalmusik" ceremony that year.

The serenade is scored for 2 flutes, piccolo, 2 oboes, 2 bassoons, 2 horns, 2 trumpets, post horn, timpani and strings. It has seven movements:

The Concertante and Rondeau movements feature prominent concertante sections for flutes, oboes, and bassoons.

The first trio of the second minuet features a solo piccolo played over strings. The second trio of the second minuet features a solo for the post horn. This solo gives the serenade its nickname.

A typical performance lasts approximately 45 minutes.

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