barbershoppern.
/ˈbɑːbəʃɒpə/, U.S. /ˈbɑrbərˌʃɑpər/ Originally U.S.
A person who performs barbershop or close harmony singing.
ΚΠ
1930 Capital Times (Madison, Wisconsin) 4 June 4/5 He could play just the right minors that the barber-shoppers needed.
1978 Amer. Speech 1975 50 293 Most hobbyists also develop an occupational language, and barbershoppers, or organized male quartet singers, are no different.
1996 R. A. Stebbins Barbershop Singer v. 66 Barbershoppers feel a strong fellowship..when they sing together.
2015 N.Y. Times (National ed.) 25 Aug. c1/2 Why my father secured tickets to a barbershop concert is unclear... Perhaps my Uncle Larry, a barbershopper in his college days, was visiting.
This is a new entry (OED Third Edition, June 2018; most recently modified version published online December 2019).
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n.1930