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  2. Piano key frequencies - Wikipedia

    en.wikipedia.org/wiki/Piano_key_frequencies

    An 88-key piano, with the octaves numbered and Middle C (cyan) and A440 (yellow) highlighted A printable version of the standard key frequencies (only including the 88 keys on a standard piano) Values in bold are exact on an idealized standard piano.

  3. Stretched tuning - Wikipedia

    en.wikipedia.org/wiki/Stretched_tuning

    Stretched tuning is a detail of musical tuning, applied to wire-stringed musical instruments, older, non-digital electric pianos (such as the Fender Rhodes piano and Wurlitzer electric piano), and some sample-based synthesizers based on these instruments, to accommodate the natural inharmonicity of their vibrating elements.

  4. Musical keyboard - Wikipedia

    en.wikipedia.org/wiki/Musical_keyboard

    Download as PDF; Printable version; ... The musical keyboard of a Steinway concert grand piano. ... (frequency: 27.5 Hz) of an 88-key piano is equivalent to a sub ...

  5. 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 ]

  6. Piano tuning - Wikipedia

    en.wikipedia.org/wiki/Piano_tuning

    A man tuning an upright piano. Piano tuning is the process of adjusting the tension of the strings of an acoustic piano so that the musical intervals between strings are in tune. The meaning of the term 'in tune', in the context of piano tuning, is not simply a particular fixed set of pitches. Fine piano tuning requires an assessment of the ...

  7. File:United States Frequency Allocations Chart 2016 - The ...

    en.wikipedia.org/wiki/File:United_States...

    Download QR code; In other projects ... United States Frequency Allocations Chart 2011 ... Version of PDF format: 1.4

  8. 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.)

  9. Pythagorean interval - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_interval

    In musical tuning theory, a Pythagorean interval is a musical interval with a frequency ratio equal to a power of two divided by a power of three, or vice versa. [1] For instance, the perfect fifth with ratio 3/2 (equivalent to 3 1 / 2 1 ) and the perfect fourth with ratio 4/3 (equivalent to 2 2 / 3 1 ) are Pythagorean intervals.