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 defines international standard pitch as A440, setting 440 Hz as the frequency of the A above middle C. Frequencies of other notes are defined relative to this pitch.
A circa 1932 Boosey & Hawkes 'Model 32' alto saxophone stamped 'LP' for Low Pitch (A=440 Hz)
A 1915 Buescher Truetone alto saxophone marked 'High Pitch' (A=456 Hertz)
A 1927 Conn New Wonder Series 2 alto saxophone marked 'H' for 'High Pitch' (A=456 Hertz). Saxophones tuned to A=440 Hz would be marked 'L', 'LP' or 'Low Pitch'
Musical tuning
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In music, there are two common meanings for tuning:Tuning practice, the act of tuning an instrument or voice.
Tuning systems, the various systems of pitches used to tune an instrument, and their theoretical bases.
Man turning tuning pegs to tune guitar
Tuning of Sébastien Érard harp using Korg OT-120 Wide 8 Octave Orchestral Digital Tuner