A
A, first note of the musical alphabet and the 6th degree of the scale of C. A is equal to 440 hertz (440 vibrations per second), this being the standard pitch. A is the note always given to orchestral players, usually by the oboe, for tuning purposes.
Citation Information
Article Title:
A
Website Name:
Encyclopaedia Britannica
Publisher:
Encyclopaedia Britannica, Inc.
Date Published:
28 October 2016
Access Date:
March 14, 2025