Post horn
Overview
 
The post horn is a valveless cylindrical brass
Brass instrument
A brass instrument is a musical instrument whose sound is produced by sympathetic vibration of air in a tubular resonator in sympathy with the vibration of the player's lips...

 or copper instrument with cupped mouthpiece, used to signal the arrival or departure of a post rider
Post riders
Post riders or postriders describes a horse and rider postal delivery system that existed at various times and various places throughout history...

 or mail coach
Mail coach
In Great Britain, the mail coach or post coach was a horse-drawn carriage that carried mail deliveries, from 1784. In Ireland, the first mail coach began service from Dublin in 1789. The coach was drawn by four horses and had seating for four passengers inside. Further passengers were later allowed...

. It was used especially by postilion
Postilion
A postilion rider was the driver of a horse-drawn coach or post chaise, mounted on one of the drawing horses...

s of the 18th and 19th centuries.

The instrument commonly had a circular or coiled shape with three turns of the tubing, though sometimes it was straight. It is therefore an example of a natural horn
Natural horn
The natural horn is a musical instrument that is the ancestor of the modern-day horn, and is differentiated by its lack of valves. It consists of a mouthpiece, some long coiled tubing, and a large flared bell. Pitch changes are made through a few different techniques:* Modulating the lip tension as...

. The cornet
Cornet
The cornet is a brass instrument very similar to the trumpet, distinguished by its conical bore, compact shape, and mellower tone quality. The most common cornet is a transposing instrument in B. It is not related to the renaissance and early baroque cornett or cornetto.-History:The cornet was...

 was developed from the post horn by adding valves
Rotary valve
A rotary valve is a type of valve in which the rotation of a passage or passages in a transverse plug regulates the flow of liquid or gas through the attached pipes. The common stopcock is the simplest form of rotary valve...

.

Mozart
Wolfgang Amadeus Mozart
Wolfgang Amadeus Mozart , baptismal name Johannes Chrysostomus Wolfgangus Theophilus Mozart , was a prolific and influential composer of the Classical era. He composed over 600 works, many acknowledged as pinnacles of symphonic, concertante, chamber, piano, operatic, and choral music...

, Mahler
Gustav Mahler
Gustav Mahler was a late-Romantic Austrian composer and one of the leading conductors of his generation. He was born in the village of Kalischt, Bohemia, in what was then Austria-Hungary, now Kaliště in the Czech Republic...

, and others incorporated the instrument into their orchestras for certain pieces.
 
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