Definition
A conductor's colorful (if slightly unhinged) instruction to brass players to clear obstructions from their instruments causing muffled or squeaky sounds. It's the musical equivalent of telling someone to clear their throat, but with more rodent imagery. Wind instruments do collect moisture and valve grease, creating some truly unfortunate noises.
Example Usage
"French horns, can you please remove the gerbil from your horn? You sound like dying geese."
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=remove%20gerbil%20from%20horn&defid=13367)
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