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tuner
A415 (Baroque)
A423 (Classical)
A432 (Schiller)
A435 (French)
A440 (Stuttgart)
A442 (Chicago)
A444 (Boston)
A447 (Vienna State Opera)
A452 (Old Philharmonic)
Concert pitch
B flat
A
G
F
E flat
D
-14c
+16c