A transposing instrument is a musical instrument for which written notes are read at a pitch different from concert pitch, which a non-transposing instrument, such as a piano, would play. On a transposing instrument, a concert C is written as a different note; the concert pitch that is played for a written C determines the key that an instrument transposes in. For example, a B♭ clarinetist playing a written C would sound a concert B♭. Transposing harmonia or electronic keyboards with a transpose function can also play a different set of pitches from what is notated, but these are not usually called transposing instruments.
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