Transposing Instrument
An instrument that sounds at a different pitch from the one written
Related
A transposing instrument sounds at a pitch different from the one written. A B♭ clarinet playing a written C sounds a B♭; an F horn playing a written C sounds an F.
The practice lets a family share fingerings: clarinets, saxophones, horns and cornets keep the same hand positions across sizes. A score may be transposed, with each part written for its instrument, or in concert pitch, so check which you have before reading.
Taking the label literally is the usual error: a B♭ instrument does not play only B♭; it sounds B♭ when it reads C. Direction is easy to reverse too: for a B♭ instrument, since the sound lies a major second below the written note, the part must be written a major second higher.
Sources
- 移调乐器的记谱惯例与常见调性，参 The New Grove Dictionary of Music and Musicians, "Transposing instruments"；本文为原创表述
Used for fact-checking only; all prose is original.