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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. Musical temperament - Wikipedia

    en.wikipedia.org/wiki/Musical_temperament

    For instance, 660 Hz / 440 Hz (a ratio of 3:2) constitutes a fifth, and 880 Hz / 440 Hz (2:1) an octave. Such intervals (termed "just") have a stability, or purity to their sound, when played simultaneously (assuming they are played using timbres with harmonic partials) because pure intervals do not waver or beat regularly.

  4. Audio frequency - Wikipedia

    en.wikipedia.org/wiki/Audio_frequency

    Frequency (Hz) Octave Description 16 to 32 1st The lower human threshold of hearing, and the lowest pedal notes of a pipe organ. 32 to 512 2nd to 5th Rhythm frequencies, where the lower and upper bass notes lie. 512 to 2,048 6th to 7th Defines human speech intelligibility, gives a horn-like or tinny quality to sound. 2,048 to 8,192 8th to 9th

  5. Musical note - Wikipedia

    en.wikipedia.org/wiki/Musical_note

    In music, notes are distinct and isolatable sounds that act as the most basic building blocks for nearly all of music. This discretization facilitates performance, comprehension, and analysis. [1] Notes may be visually communicated by writing them in musical notation.

  6. Piano tuning - Wikipedia

    en.wikipedia.org/wiki/Piano_tuning

    For example, if a piano string tuned to 440 Hz (vibrations per second) is played together with a piano string tuned to 442 Hz, the resulting tone beats at a frequency of 2 Hz, due to the constructive and destructive interference between the two sound waves.

  7. The IRS just announced big tax changes for 2025 - AOL

    www.aol.com/finance/irs-just-announced-big-tax...

    The IRS just dropped a raft of changes, big and small, to the U.S. tax code that could shift how much you owe — or save — in 2025. From bigger deductions to higher limits on health-related ...

  8. Florida QB DJ Lagway carted off with left hamstring injury vs ...

    www.aol.com/sports/florida-qb-dj-lagway-carted...

    Florida quarterback DJ Lagway was carried to a waiting cart after suffering a left hamstring injury in the second quarter of the Gators’ game vs. No. 2 Georgia on Saturday.

  9. The best stocking stuffers for women - AOL

    www.aol.com/lifestyle/best-stocking-stuffers...

    The cones are easier to store than a candle and can be used in multiple places at once. And with notes of citrus, spice, and sandalwood, this incense will be adored. $20 at Moco Fragrances.