transposing instrument(redirected from B-flat instrument)
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(Instruments) a musical instrument, esp a horn or clarinet, pitched in a key other than C major, but whose music is written down as if its basic scale were C major. A piece of music in the key of F intended to be played on a horn pitched in F is therefore written down a fourth lower than an ordinary part in that key and has the same key signature as a part written in C
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