440hz reference tone
2,778 views - 19 Jan 2011
a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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![Violin Tuner (GDAE) in A 440Hz [ INTERACTIVE ]](https://i.ytimg.com/vi/KqNL3ODb7MM/mqdefault.jpg)
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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a440 or a4, which has a frequency of 440 hz, is the musical note a above middle c and serves as a general tuning standard for musical pitch.
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