The alphorn or alpenhorn or alpine horn is a labrophone, consisting of a wooden natural horn of conical bore, having a wooden cup-shaped mouthpiece, used by mountain dwellers in the Swiss Alps, Austrian Alps, Bavarian Alps in Germany, French Alps, and elsewhere. Similar wooden horns were used for communication in most mountainous regions of Europe, from the Alps to the Carpathians.
The Swiss Alpenhorn was used as a call to battle or warning of fire in high mountain districts of Switzerland. It was first used to play tunes at the end of the 18th century.
Source: https://www.factretriever.com/switzerland-facts, https://en.wikipedia.org/wiki/Alphorn