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A Jankó keyboard. The Jankó keyboard is a musical keyboard layout for a piano designed by Paul von Jankó, a Hungarian pianist and engineer, in 1882.It was designed to overcome two limitations on the traditional piano keyboard: the large-scale geometry of the keys (stretching beyond a ninth, or even an octave, can be difficult or impossible for pianists with small hands), and the fact that ...
A musical keyboard is the set of adjacent depressible levers or keys on a musical instrument. Keyboards typically contain keys for playing the twelve notes of the Western musical scale, with a combination of larger, longer keys and smaller, shorter keys that repeats at the interval of an octave.
Erv Wilson patented a keyboard in 1967 with five perpendicular chromatic lines of keys in an octave, using fourths as generators. Robert Moog built a prototype with undercut round front rectangular keys. Herman van der Horst built the first of four staggered square key Archiphones in 1970 for Anton de Beer.
An isomorphic keyboard is a musical input device consisting of a two-dimensional grid of note-controlling elements (such as buttons or keys) on which any given sequence and/or combination of musical intervals has the "same shape" on the keyboard wherever it occurs – within a key, across keys, across octaves, and across tunings.
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In the common practice of much modern western music, especially improvised music like jazz, almost every chromatic note is commonly used within any key signature. It initially was argued that the less-intuitive ergonomic access to chromatic intervals would prove to be a detriment to performing musical styles that make heavier use of dissonance.