bn:03167509n
Noun Named Entity
Categories: ISO standards, Musical tuning
EN
A440  440Hz  440 Hz  Chorton  Concert C
EN
A440 is the musical pitch corresponding to an audio frequency of 440 Hz, which serves as a tuning standard for the musical note of A above middle C, or A4 in scientific pitch notation. Wikipedia
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EN
A440 is the musical pitch corresponding to an audio frequency of 440 Hz, which serves as a tuning standard for the musical note of A above middle C, or A4 in scientific pitch notation. Wikipedia
The frequency of the note A above middle C used in standard western music theory Wikipedia Disambiguation
The use of the musical note A to reference musical pitch Wikipedia Disambiguation
IS A