A transposing instrument is one whose notated pitch is different from its sounding pitch. For example, a Bb clarinet will sound the note “Bb” when a “C” is played. To make such an instrument agree with the rest of the orchestra, the part for the transposing instrument is in a different key and has a different key signature than the parts for C instruments. Common transposing instruments are clarinets (Bb and A), trumpets (Bb), French horns (F) and English horns (F).
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