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  2. Piano key frequencies - Wikipedia

    en.wikipedia.org/wiki/Piano_key_frequencies

    Values in bold are exact on an idealized standard piano. Keys shaded gray are rare and only appear on extended pianos. The normal 88 keys were numbered 1–88, with the extra low keys numbered 89–97 and the extra high keys numbered 98–108. A 108-key piano that extends from C 0 to B 8 was first built in 2018 by Stuart & Sons. [4]

  3. Orders of magnitude (frequency) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude...

    Acoustic – frequency of G −7, the lowest note sung by the singer with the deepest voice in the world, Tim Storms. His vocal cords vibrate 1 time every 5.29 seconds. 10 0: 1 hertz (Hz) 1 to 1.66 Hz: Approximate frequency of an adult human's resting heart beat: 1 Hz: 60 bpm, common tempo in music 2 Hz: 120 bpm, common tempo in music ~7.83 Hz

  4. Piano tuning - Wikipedia

    en.wikipedia.org/wiki/Piano_tuning

    The easiest intervals to identify and tune are those where the note frequencies have a simple whole-number ratio (e.g. octave with a 2:1 ratio, perfect fifth with 3:2, etc.) because the harmonics of these intervals coincide and beat when they are out of tune. (For a perfect fifth, the 3rd harmonic of the lower note coincides with the 2nd ...

  5. List of musical symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_musical_symbols

    Time signatures indicate the number of beats in each measure (the top number) and also show what type of note represents a single beat (the bottom number). There may be any number of beats in a measure but the most common by far are multiples of 2 or 3 (i.e., a top number of 2, 3, 4, or 6). Likewise, any note length can be used to represent a ...

  6. Musical note - Wikipedia

    en.wikipedia.org/wiki/Musical_note

    Longer note values ... (in Hertz) octave name note names ... is the MIDI note number. 69 is the number of semitones between C −1 (MIDI note ...

  7. Pythagorean tuning - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_tuning

    The purpose of this adjustment is to move the 12 notes within a smaller range of frequency, namely within the interval between the base note D and the D above it (a note with twice its frequency). This interval is typically called the basic octave (on a piano keyboard, an octave has only 12 keys).

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  9. Musical tuning - Wikipedia

    en.wikipedia.org/wiki/Musical_tuning

    In just intonation, the frequencies of the scale notes are related to one another by simple numeric ratios, a common example of this being ⁠ 1 / 1 ⁠, ⁠ 9 / 8 ⁠, ⁠ 5 / 4 ⁠, ⁠ 4 / 3 ⁠, ⁠ 3 / 2 ⁠, ⁠ 5 / 3 ⁠, ⁠ 15 / 8 ⁠, ⁠ 2 / 1 ⁠ to define the ratios for the seven notes in a C major scale, plus the return to the ...

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