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.

Date of composition 1779 (1779 August) in Salzburg, Austria
First published 1792 ca. – Offenbach: Johann André (or earlier. As Op.22 "Sinfonie".)
Type Serenade
Tonality D Major
Catalogue KV 320
Instruments Orchestra
Links
Autotranslations beta Wolfgang Amadeus Mozart: Sérénade n°9 en ré majeur, KV 320 "Serenade No.9 ; Posthorn Serenade"
Wolfgang Amadeus Mozart: Serenata n. 9 in re maggiore, KV 320 "Serenade No.9 ; Posthorn Serenade"
Wolfgang Amadeus Mozart: Serenade Nr. 9 D-dur, KV 320 "Serenade No.9 ; Posthorn Serenade"