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There is the French Horn and a Bb Horn.
HORN-a-dee HORN-a-dee HORN-a-dee HORN-a-dee
hook a wire up to the (+) side of the battery and put it to the horn if the horn blows it a good horn if not replace the horn
No, horn does not need to be capitalised.
Ambiguous.
Most likely though, a horn in F, a double horn, or, less often, a Bb horn. Or, not a marching horn.