bayan
bayan is a chromatic button accordion.
Also recorded as bajan.
Overview
Russian chromatic button-key accordion.
In detail
bayan is a chromatic button accordion.
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
“Bayan (accordion)”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q804099: bayan
Consult the source