natural horn
natural horn is an end-blown labrosone or family of musical instruments.
Also recorded as end-blown labrosones with curved or folded tubes; end-blown horns.
Overview
Unvalved ancestor of modern-day horn.
In detail
It forms part of MIMO's classification of musical instruments and Hornbostel–Sachs.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Natural horn”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q1757829: natural horn
Consult the source