Equal temperament
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Equal temperament is a musical temperament that divides the octave into 12 identical parts. It is a logarithmic scale with a ratio equal to the 12th root of 2. The scale unit is known as a semitone or
Prince Zhu Zaiyu constructed 12 string equal temperament tuning instrument, front and back view
Zhu Zaiyu's equal temperament pitch pipes
Simon Stevin's Van de Spiegheling der singconst c. 1605
Concert pitch
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Concert pitch is 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 time. The ISO def
Equal temperament
…classical music, since the 18th century. It has also been used in other cultures. In modern times, equal temperament is usually tuned relative to a standard pitch of 440 Hz. Over the past few centuries, standard pitch has risen significantly. The intervals of 12 TET closely approximate some intervals in just…
A circa 1932 Boosey & Hawkes 'Model 32' alto saxophone stamped 'LP' for Low Pitch (A=440 Hz). Saxophones tuned to A=456 Hz would be marked 'H', 'HP' or 'High Pitch'
A 1915 Buescher Truetone alto saxophone marked 'High Pitch' (A=456 Hertz). Saxophones tuned to A=440 Hz would be marked 'L', 'LP' or 'Low Pitch'
A 1927 Conn New Wonder Series 2 alto saxophone marked 'H' for 'High Pitch' (A=456 Hertz)