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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. Helmholtz pitch notation - Wikipedia

    en.wikipedia.org/wiki/Helmholtz_pitch_notation

    The naming of individual Cs using the Helmholtz system. Helmholtz pitch notation is a system for naming musical notes of the Western chromatic scale.Fully described and normalized by the German scientist Hermann von Helmholtz, it uses a combination of upper and lower case letters (A to G), [a] and the sub- and super-prime symbols ( ͵ ′ or ⸜ ⸝) to denote each individual note of the scale.

  6. 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.)

  7. List of musical scales and modes - Wikipedia

    en.wikipedia.org/wiki/List_of_musical_scales_and...

    Use of key signature usual or unusual 15 equal temperament: 15-tet scale on C. Play ⓘ — — — 15 — — — 16 equal temperament: 16-tet scale on C. Play ⓘ — — — 16 — — 17 equal temperament: 17-tet scale on C. Play ⓘ — — — 17 — — 19 equal temperament: 19-tet scale on C. Play ⓘ — — — 19 — — 21 equal ...

  8. U.S. dietary guidelines should emphasize beans and ... - AOL

    www.aol.com/u-dietary-guidelines-emphasize-beans...

    A report on proposed changes to U.S. dietary guidelines suggests encouraging Americans to eat more beans and lentils for protein and less red meat.

  9. Musical keyboard - Wikipedia

    en.wikipedia.org/wiki/Musical_keyboard

    The lowest pitch (frequency: 27.5 Hz) of an 88-key piano is equivalent to a sub contrabass in the range name. Some modern pianos have even more notes (a Bösendorfer 290 "Imperial" has 97 keys, and a Stuart & Sons model has 108 keys [ 1 ] ).

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