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plural pitchpipes
(music) A small pipe used to set the pitch for an instrument, song etc. quotations examples
The lady with the spiritual bent blew a pitchpipe and the choir members began singing lustily, “Oh, Jesus, walk by my side, / Then I always, always be satisfied.”
a. 1969, John Kennedy Toole, A Confederacy of Dunces, Penguin, published 1981