Concert Pitch

Concert pitch refers to the pitch reference to which a group of musical instruments are tuned for a performance. Concert pitch may vary from ensemble to ensemble, and has varied widely over musical history. In the literature this is also called international standard pitch. The reference note most commonly used is the "A" above middle C.

The term "concert pitch" is also used to distinguish between the "written" and "sounding" notes of a transposing instrument - concert pitch here refers to the pitch on a non-transposing instrument. Music for transposing instruments is transposed into different keys from that of non-transposing instruments—for example, playing a written C on a B♭ clarinet or trumpet produces a non-transposing instrument's B♭. This pitch is referred to as "concert B♭".

Read more about Concert Pitch:  Modern Standard Concert Pitch, History of Pitch Standards in Western Music

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