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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. Orders of magnitude (frequency) - Wikipedia

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

   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: Fundamental frequency of the Schumann resonances: 10 1: 10 hertz 10 Hz: Cyclic rate of a typical automobile engine at idle (equivalent to 600 rpm) 12 Hz

4. Wicki–Hayden note layout - Wikipedia

   en.wikipedia.org/wiki/Wicki–Hayden_note_layout

   Tuning Exploration, play the Wicki layout on your computer keyboard while changing the tuning dynamically. The Hayden duet system concertina – Resource List . Relayer : an app (Windows and OS X) that enables musicians who play the QWERTY computer keyboard or the AXiS-49 MIDI controller, to play in a wide variety of isomorphic note layouts ...

5. IBM PC keyboard - Wikipedia

   en.wikipedia.org/wiki/IBM_PC_keyboard

   Another example is the Emacs editor, which makes extensive use of modifier keys, and uses the Control key more than the meta key (IBM PC instead has the Alt key) – these date to the Knight keyboard, which had the Control key on the inside of the Meta key, opposite to the Model M, where it is on the outside of the Alt key; and to the space ...

6. Micro Electronics, Inc. - Wikipedia

   en.wikipedia.org/wiki/Micro_Electronics,_Inc.

   Micro Electronics, Inc. (MEI) is an American privately held company headquartered in Hilliard, Ohio.Founded in 1979 by John Baker, [1] it serves as the parent company of the computer retailer Micro Center, its online division Micro Center Online, and its brand iPSG, [2] which houses PowerSpec PC, WinBook, and Inland (including Inland Premium for high-end SSDs).

7. Electronic keyboard - Wikipedia

   en.wikipedia.org/wiki/Electronic_keyboard

   Yamaha PSR-290 electronic keyboard A MIDI song played on a Casio electronic keyboard. An electronic keyboard, portable keyboard, or digital keyboard is an electronic musical instrument based on keyboard instruments. [1] Electronic keyboards include synthesizers, digital pianos, stage pianos, electronic organs and digital audio workstations.

8. Cent (music) - Wikipedia

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

   The next note is sharper than C by the assigned value in cents. Finally, the two notes are played simultaneously. Note that the JND for pitch difference is 5–6 cents. Played separately, the notes may not show an audible difference, but when they are played together, beating may be heard (for example if middle C and a note 10 cents higher are ...

9. D (musical note) - Wikipedia

   en.wikipedia.org/wiki/D_(musical_note)

   D [1] is a musical note a whole tone above C, and is known as Re within the fixed-Do solfege system. Its enharmonic equivalents are C (C-double sharp) and E (E-double flat). It is the third semitone of the solfège. When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of middle D (D 4) is ...