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  2. Piano maintenance - Wikipedia

    en.wikipedia.org/wiki/Piano_maintenance

    When a piano is only slightly out of tune, it loses the glowing tonal quality characteristic of a freshly tuned piano, especially because each note in the middle and upper range is sounded by more than one string, and these may get slightly out of tune with each other. Pianos that are more than slightly out of tune tend to be unpleasant to play ...

  3. 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]

  4. 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 ...

  5. Piano acoustics - Wikipedia

    en.wikipedia.org/wiki/Piano_acoustics

    The Railsback curve shows how a piano tuned to compensate for inharmonicity deviates from theoretically correct equal-tempered tuning. The Railsback curve, first measured in the 1930s by O.L. Railsback, a US college physics teacher, expresses the difference between inharmonicity-aware stretched piano tuning, and theoretically correct equal-tempered tuning in which the frequencies of successive ...

  6. Musical keyboard - Wikipedia

    en.wikipedia.org/wiki/Musical_keyboard

    The chromatic range (also called compass) of keyboard instruments has tended to increase. Harpsichords often extended over five octaves (>60 keys) in the 18th century, while most pianos manufactured since about 1870 have 88 keys. The lowest pitch (frequency: 27.5 Hz) of an 88-key piano is equivalent to a sub contrabass in the range name.

  7. Stretched tuning - Wikipedia

    en.wikipedia.org/wiki/Stretched_tuning

    Stretched tuning is a detail of musical tuning, applied to wire-stringed musical instruments, older, non-digital electric pianos (such as the Fender Rhodes piano and Wurlitzer electric piano), and some sample-based synthesizers based on these instruments, to accommodate the natural inharmonicity of their vibrating elements.

  8. What is a normal blood pressure reading? - AOL

    www.aol.com/lifestyle/normal-blood-pressure...

    When Dr. Oz sat Rachael Ray down for a blood pressure test during a segment of her show, he wasn't entirely pleased with the numbers he saw. In fact, he made her do it again -- and he called her ...

  9. Range (music) - Wikipedia

    en.wikipedia.org/wiki/Range_(music)

    The terms sounding range, written range, designated range, duration range and dynamic range have specific meanings. The sounding range [ 3 ] refers to the pitches produced by an instrument, while the written range [ 3 ] refers to the compass (span) of notes written in the sheet music, where the part is sometimes transposed for convenience.