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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. The Virtuoso Pianist in 60 Exercises - Wikipedia

    en.wikipedia.org/wiki/The_Virtuoso_Pianist_in_60...

    The Virtuoso Pianist (Le Pianiste virtuose) by Charles-Louis Hanon (1819 – 1900), is a compilation of sixty exercises meant to train the pianist in speed, precision, agility, and strength of all of the fingers and flexibility in the wrists.

  4. Keyboard matrix circuit - Wikipedia

    en.wikipedia.org/wiki/Keyboard_matrix_circuit

    A keyboard matrix circuit is a design used in most electronic musical keyboards and computer keyboards in which the key switches are connected by a grid of wires, similar to a diode matrix. For example, 16 wires arranged in 8 rows and 8 columns can connect 64 keys—sufficient for a full five octaves of range (61 notes).

  5. Action (piano) - Wikipedia

    en.wikipedia.org/wiki/Action_(piano)

    Action can refer to that of a piano or other musical keyboards, including the electronic or digital stage piano and synthesizer, on which some models have "weighted keys", which simulate the touch and feel of an acoustic piano. The design of the key action mechanism determines the "weight" of the keys, i.e., the force required to sound a note ...

  6. Circle of fifths - Wikipedia

    en.wikipedia.org/wiki/Circle_of_fifths

    The key signatures associated with those pitches change accordingly: the key of G has one sharp, the key of D has 2 sharps, and so on. Proceeding counterclockwise from the top of the circle, the notes change by descending fifths and the key signatures change accordingly: the key of F has one flat, the key of B ♭ has 2 flats, and so on.

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