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2. Piano key frequencies - Wikipedia

   en.wikipedia.org/wiki/Piano_key_frequencies

   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. A ...

3. A440 (pitch standard) - Wikipedia

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

   A440, piano and violin. A440 (also known as Stuttgart pitch[ 1 ]) 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. It is standardized by the International Organization for Standardization as ISO 16.

4. Scientific pitch notation - Wikipedia

   en.wikipedia.org/wiki/Scientific_pitch_notation

   The table below gives notation for pitches based on standard piano key frequencies: standard concert pitch and twelve-tone equal temperament. When a piano is tuned to just intonation, C 4 refers to the same key on the keyboard, but a slightly different frequency. Notes not produced by any piano are highlighted in medium gray, and those produced ...

5. Musical keyboard - Wikipedia

   en.wikipedia.org/wiki/Musical_keyboard

   A musical keyboard is the set of adjacent depressible levers or keys on a musical instrument. Keyboards typically contain keys for playing the twelve notes of the Western musical scale, with a combination of larger, longer keys and smaller, shorter keys that repeats at the interval of an octave. Pressing a key on the keyboard makes the ...

6. List of Korg products - Wikipedia

   en.wikipedia.org/wiki/List_of_Korg_products

   Korg SP-100: An 88 key velocity sensitive hammer-action simulation keyboard. Weighing just over 40 pounds, the 32-note polyphonic Korg SP-100 is a truly portable (and affordable) answer for the gigging musician. The 88-note hammer action keyboard is velocity sensitive with three selections for touch control: Light, standard and heavy.

7. C (musical note) - Wikipedia

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

   C (musical note) C or Do is the first note of the C major scale, the third note of the A minor scale (the relative minor of C major), and the fourth note (G, A, B, C) of the Guidonian hand, commonly pitched around 261.63 Hz. The actual frequency has depended on historical pitch standards, and for transposing instruments a distinction is made ...