Maybe, just maybe, this song answers my question about a song called O'Brien which is a macaronic mix of English, Yiddish and Hebrew, composed in 1920s by Philip Ney --- I couldn't think why it was called "O'Brien", unless that was the name of someone Ney knew. "For he's a jolly good fellow" is part of the song, and the tune is similar to the He's a Jolly Good Fellow song O' Brien https://archive.org/details/obrien "O'Brien," variant of macaronic song (in Yiddish, Hebrew and English) written by Canadian Philip Ney in the 1920s. Performed by Norval (Nokhem) Slobin (1911-1997). Recorded by Mark Slobin, Detroit, March 1974. YIVO Folksong Project, Max and Frieda Weinstein Archive of YIVO Sound Recordings. sung by Kaplan Moe 1948 https://ataleoftwomuseums.yivo.org/items/show/5919
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