bass trombone
bass trombone is a brass instrument or trombone.
Overview
Low-pitched member of the trombone family of brass musical instruments.
In detail
bass trombone is a brass instrument or trombone.
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
“Bass trombone”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q10426885: bass trombone
Consult the source