Jazz slang for the tuba, the lowest-pitched and largest of the brass instruments. The name is perfect: tubas grunt, rumble, and blat in exactly the way the nickname implies, providing the deep harmonic foundation under a jazz or brass band arrangement. Grunt-horn is the kind of warm, affectionate insider label that musicians use — it acknowledges both the sound the instrument makes and the slightly unglamorous job it has to do.
The bandleader pointed to the new kid and said they needed someone on grunt-horn — did he want to give it a shot?
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(jazz, slang) A tuba.
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