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  2. Beats Electronics - Wikipedia

    en.wikipedia.org/wiki/Beats_Electronics

    Beats Electronics LLC. Beats Electronics LLC (also known as Beats by Dr. Dre, or simply Beats by Dre) is an American consumer audio products manufacturer headquartered in Culver City, California. [1] [2] The company was founded in 2006 by music producer Dr. Dre and record company executive Jimmy Iovine. Since 2014, it has been an Apple subsidiary.

  3. Cent (music) - Wikipedia

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

    A cent is a unit of measure for the ratio between two frequencies. An equally tempered semitone (the interval between two adjacent piano keys) spans 100 cents by definition. An octave —two notes that have a frequency ratio of 2:1—spans twelve semitones and therefore 1200 cents. The ratio of frequencies one cent apart is precisely equal to ...

  4. Stylophone - Wikipedia

    en.wikipedia.org/wiki/Stylophone

    The Stylophone is a miniature analog electronic keyboard musical instrument played with a stylus. Invented in 1967 by Brian Jarvis, [1] it entered production in 1968, manufactured by Dubreq. Some three million Stylophones were sold, mostly as children's toys, but they were occasionally used by professional musicians such as John Lennon, [2 ...

  5. United States twenty-dollar bill - Wikipedia

    en.wikipedia.org/wiki/United_States_twenty...

    Contents. United States twenty-dollar bill. The United States twenty-dollar bill (US$20) is a denomination of U.S. currency. A portrait of Andrew Jackson, the seventh U.S. president (1829–1837), has been featured on the obverse of the bill since 1928; the White House is featured on the reverse. As of December 2018, the average life of a $20 ...

  6. British and American keyboards - Wikipedia

    en.wikipedia.org/wiki/British_and_American_keyboards

    The UK keyboard has 1 more key than the U.S. keyboard (UK=62, US=61, on the typewriter keys, 102 v 101 including function and other keys, 105 vs 104 on models with Windows keys) The extra key is added next to the Enter key to accommodate # ( number sign) and ~ ( tilde) The Alt key to the right of the space bar is replaced by an AltGr key.

  7. E-mu Emulator - Wikipedia

    en.wikipedia.org/wiki/E-mu_Emulator

    Emulator. E-mu Emulator (1981) Finally released in 1981, the Emulator was a floppy disk-based keyboard workstation that enabled the musician to sample sounds, recording them to storage media and allowing them to be played as musical notes on the keyboard. The 5 " floppy disk drive enabled the owner to build a library of samples and share them ...