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2. Piano key frequencies - Wikipedia

   en.wikipedia.org/wiki/Piano_key_frequencies

   This is a list of the fundamental frequencies in hertz (cycles per second) of the keys of a modern 88-key standard or 108-key extended piano in twelve-tone equal temperament, with the 49th key, the fifth A (called A 4), tuned to 440 Hz (referred to as A440). [1] [2] Every octave is made of twelve steps called semitones.

3. Scientific pitch notation - Wikipedia

   en.wikipedia.org/wiki/Scientific_pitch_notation

   An 88-key piano keyboard, with the octaves numbered and middle C (cyan) and A440 (yellow) highlighted. The table below gives notation for pitches based on standard piano key frequencies: standard concert pitch and twelve-tone equal temperament.

4. A440 (pitch standard) - Wikipedia

   en.wikipedia.org/wiki/A440_(pitch_standard)

   An 88-key piano, with the octaves numbered and middle C (cyan) and A 4 (yellow) highlighted. A440 is widely used as concert pitch in the United Kingdom [8] and the United States. [9] In continental Europe the frequency of A 4 commonly varies between 440 Hz and 444 Hz. [8]

5. File:Piano Frequencies.svg - Wikipedia

   en.wikipedia.org/wiki/File:Piano_Frequencies.svg

   English: This is a 88 key piano layout with octaves illustrated and hovering that reveals the frequency for the key. (The numbered octaves are black on transparency. They will not show up if the image is displayed on a black background, such as if the background of your browser is set to black, or is black when you open images separately.)

6. C (musical note) - Wikipedia

   en.wikipedia.org/wiki/C_(musical_note)

   For an instrument in equal temperament tuned to the A440 pitch standard widely adopted in 1939, middle C has a frequency around 261.63 Hz [1] (for other notes see piano key frequencies). Scientific pitch was originally proposed in 1713 by French physicist Joseph Sauveur and based on the numerically convenient frequency of 256 Hz for middle C ...

7. Talk:Scientific pitch notation - Wikipedia

   en.wikipedia.org/wiki/Talk:Scientific_pitch_notation

   The table that is part of the article does assume this, and the article on piano key frequencies does too. But, if for example you choose to tune an organ to mean tone tuning, middle C is still C4, and the A above it is still A4. It may not be A440 however (depending on exactly how you've chosen to implement your mean tones).