[FairfieldLife] Re: Perfect pitch, anybody??

[he...@hotmail.com [FairfieldLife]]

 Wikipedia:
 

 A440 or A4, which has a frequency of 440 Hz 
https://en.wikipedia.org/wiki/Hertz, is the musical note 
https://en.wikipedia.org/wiki/Musical_note A 
https://en.wikipedia.org/wiki/A_(musical_note) above middle C 
https://en.wikipedia.org/wiki/Middle_C and serves as a general tuning standard 
for musical pitch https://en.wikipedia.org/wiki/Pitch_(music).
 Prior to the standardization on 440 Hz, many countries and organizations 
followed the Austrian https://en.wikipedia.org/wiki/Austriagovernment's 1885 
recommendation of 435 Hz, which had also been the French standard since the 
1860s.[1] https://en.wikipedia.org/wiki/A440_(pitch_standard)#cite_note-1 The 
American music industry reached an informal standard of 440 Hz in 1926, and 
some began using it in instrument manufacturing. In 1936 the American Standards 
Association 
https://en.wikipedia.org/wiki/American_Standards_Associationrecommended that 
the A above middle C be tuned to 440 Hz.[2] 
https://en.wikipedia.org/wiki/A440_(pitch_standard)#cite_note-2 This standard 
was taken up by theInternational Organization for Standardization 
https://en.wikipedia.org/wiki/International_Organization_for_Standardization in 
1955 (reaffirmed by them in 1975) as ISO 16.[3] 
https://en.wikipedia.org/wiki/A440_(pitch_standard)#cite_note-3 Although not 
universally accepted, since then it has served as the audio frequency 
https://en.wikipedia.org/wiki/Frequency reference for the calibration of 
acoustic equipment and the tuning of pianos, violins, and other musical 
instruments.