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  2. Musical keyboard - Wikipedia

    en.wikipedia.org/wiki/Musical_keyboard

    A 7/8 size (140 mm (5.5 in) octave span) keyboard was developed by Canadian Christopher Donison in the 1970s. This size, along with the 15/16 size (152 mm (6.0 in) octave span) and a smaller size (130 mm (5.1 in) octave span) have since been developed and marketed by Steinbuhler & Company in Pennsylvania.

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    Sales workers are among the most common in the country, with 8.8% of workers nationally employed in sales and related occupations. In six states, sales workers comprise more than 1 in 10 jobs.

  4. Musical note - Wikipedia

    en.wikipedia.org/wiki/Musical_note

    Notes in it include a prime symbol below the note's letter. Names of subsequent lower octaves are preceded with "sub". Notes in each include an additional prime symbol below the note's letter. The octave starting at tenor C is called the "small" octave. Notes in it are written as lower case letters, so tenor C itself is written c in Helmholtz ...

  5. Wicki–Hayden note layout - Wikipedia

    en.wikipedia.org/wiki/Wicki–Hayden_note_layout

    The color schemes above divide the 12 basic notes of the chromatic scale into groups in different ways: Piano (7–5): two asymmetrical groups of 7 (white keys) and 5 (black keys) Whole Tone Scale (6–6): two symmetrical groups of notes a major second apart (6 notes per group)

  6. 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.

  7. Piano roll - Wikipedia

    en.wikipedia.org/wiki/Piano_roll

    Piano rolls allow the user to enter the pitch, length and velocity of notes manually, instead of recording the output of a keyboard or other device for entering note data. Usually a means of manually editing other aspects of the MIDI data, such as pitch bend or modulation , is also present, although not strictly part of the piano roll itself.

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