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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. Octave - Wikipedia

    en.wikipedia.org/wiki/Octave

    In scientific pitch notation, a specific octave is indicated by a numerical subscript number after note name. In this notation, middle C is C 4, because of the note's position as the fourth C key on a standard 88-key piano keyboard, while the C an octave higher is C 5.

  4. Stretched tuning - Wikipedia

    en.wikipedia.org/wiki/Stretched_tuning

    If the interval is two octaves plus a fifth (the favored means of cross-checking the stretch of the upper treble of the piano), exactly matching the upper note to the sixth harmonic of the lowest requires great sophistication of octave stretch to make the lower individual octaves, its double and triple octaves, and their other intervallic ...

  5. List of musical symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_musical_symbols

    A "15" below indicates a two-octave shift. These numbers may also be used above the clef to indicate pitches one or two octaves higher. A treble clef with an eight below is the most common version, typically used in music for guitar or tenor voice. Sometimes a shift of one octave up is indicated by drawing two clefs instead of one. On a 5-line ...

  6. Piano - Wikipedia

    en.wikipedia.org/wiki/Piano

    The inharmonicity of piano strings requires that octaves be stretched, or tuned to a lower octave's corresponding sharp overtone rather than to a theoretically correct octave. If octaves are not stretched, single octaves sound in tune, but double—and notably triple—octaves are unacceptably narrow.

  7. Piano tuning - Wikipedia

    en.wikipedia.org/wiki/Piano_tuning

    A common method of tuning the piano begins with tuning all the notes in the "temperament" octave in the lower middle range of the piano, usually F3 to F4. A tuner starts by using an external reference, usually an A440 tuning fork , (or commonly a C523.23 tuning fork) to tune a beginning pitch, and then tunes the other notes in the "temperament ...

  8. Pythagorean tuning - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_tuning

    This interval is typically called the basic octave (on a piano keyboard, an octave has only 12 keys). This dates to antiquity: in Ancient Mesopotamia, rather than stacking fifths, tuning was based on alternating ascending fifths and descending fourths (equal to an ascending fifth followed by a descending octave), resulting in the notes of a ...

  9. Chromatic scale - Wikipedia

    en.wikipedia.org/wiki/Chromatic_scale

    Chromatic scale: every key of one octave on the piano keyboard. The chromatic scale (or twelve-tone scale) is a set of twelve pitches (more completely, pitch classes) used in tonal music, with notes separated by the interval of a semitone.

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