Johnny-one-note

• Johnny one note, Johnny one-note, Johnny One-note, Johnny One Note

"Johnny One Note" is a show tune from the 1937 Rodgers and Hart musical Babes in Arms. The lyrics tell a story of a male vocalist named Johnny who sang with a band and could sing only one note, but sang that note extremely well.

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Johnny-one-note (plural Johnny-one-notes)

1. (idiomatic, chiefly Canada, US) A person (or organization) who often expresses a strong opinion or viewpoint on a single subject or a few particular subjects.
2. (idiomatic, chiefly Canada, US) An opinion or viewpoint on a single subject or a few particular subjects which is frequently expressed by a person or organization.
   • 1945 July 9, “The Press: Confessions of a Grouch”, in Time‎, volume 46, number 1, archived from the original on 2013-08-06:

     Whether his boss (Hearst) had told him to get off his Johnny-one-note of hate toward labor leaders, foreigners and New Dealers, or whether Pegler had decided all by himself to change his tune, no one knew.

• one-note