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If you’ve ever gone to hear an orchestra play, you know
that the performance begins only after a session of tuning.
An oft-repeated story tells of a visiting foreigner attending
a concert in Paris. Afterwards, when asked which part of the
performance he liked best, he replied, “The beginning,
just before the man with the stick came in.”
Tuning means adjusting the pitch of an instrument. The pitch
of a sound depends on its frequency, the number of vibrations
per second that produce the sound. For example, plucking a cello
string might cause it to vibrate back and forth 200 times each
second. You hear that sound as a low pitch of 200 cycles per
second, or 200 hertz.
An orchestra tunes itself to a very particular frequency, usually
440 hertz, a note known as A 440. The note is played by the
oboist, and the rest of the orchestra tunes their instruments
to match it. The oboe leads the tuning because of all the instruments,
it is least affected by humidity or other weather conditions.
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