A 음 진동수 440Hz는 자연법칙도 아니고 신이 정해준것도 아니고
관련협회들이 제.정.한것이다
절대음감은 없는거지.
1640
Vienna Franciscan Organ A457.6
1699
Paris Opera A404
1711
John Shore's tuning fork, a pitch of A423.5 He invented the tuning fork, one of which still exists today.
1780
Stines, for Mozart, A421
1780
Organ builder Schulz A421.3
1714
Strasbourg Cathedral organ A391
1722
Dresden's chief Roman Catholic church organ A415
1759
Trinity College Cambridge organ A309
1762
Stringed instruments at Hamburg A405
1772
Gottfried Silbermann built the organ in the main Roman Catholic church in Dresden, and it had a pitch of A 415 at the time.
1780
Organ builder Schulz A421.3
1780
Stein's tuning fork A422.6
1751
Handel's own fork A422.5
1800
Broadwood's C fork, 505.7, which is about half a semitone lower than that of today
1811
Paris Grand Opera A 427
1812
Paris Conservatoire A440, as modern pitch
1813
George Smart adopted for the Philharmonic Society the pitch of A423.3.
1820
Westminster Abbey organ and possibly Paris Comic Opera used a pitch of A422.5.
1828
Philharmonic Society A 440
1834
Vienna Opera A 436.5
1835
Wolfels piano maker A443
1836
Pleyel's Pianos A446
1846
Philharmonic pitch was A452.5 (very high) which lasted till 1854
1846
Mr Hipkins piano tuner (Meantone) A433.5 (Equal) A436.0
1849
Broadwood's medium pitch was A445.9 which lasted till 1854
1858
New Philharmonic pitch C522
1860
Cramer's piano makers of London A448.4
1862
Dresden Opera A 440
1871
Covent Garden Opera House A 440
1877
Collard's piano maker standard pitch was A 449.9
1877
St. Paul Cathedral organ A446.6
1877
Chappell Pianos A455.9
1877
Mr Hipkins piano tuner A448.8
1878
Her Majesty's Organ A436.1
1878
Vienna Opera A447
1879
Covent Garden Opera A450
1879
Erard's factory fork 455.3
1879
Steinway of England A 454.
1879
British Army regulation pitch for woodwinds A451.9
1880
Brinsmead, Broadwood, and Erard apparently used a pitch of A455.3
1880
Steinway may have been using a pitch of A436. According to Steinway of New York, 1880 is right around the time they switched from three piece rims to the continuous rim that is used today. So it is unlikely the pitch was any higher before 1880, yet Steinway of London had a fork A454.7.
1885
In Vienna a pitch of A435.4 was adopted at a temperature of 59 degrees Fahrenheit for A.
1885
At an international exhibition of inventions and music in London a pitch of A452 was adopted.
1896
Philharmonic pitch A439, giving C522
1925
On the 11th of June the American music industry adopted A440.
1936
American Standards Association adopted A440.
1939
At an international conference A440 was adopted.
(출처 : http://www.uk-piano.org/history/pitch.html)