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The Harmonic Table note-layout, or tonal array, is a key layout for musical instruments that offers interesting advantages over the traditional keyboard layout. Its symmetrical, hexagonal pattern of interval sequences places the notes of the major and minor triads together. It is sometimes called the ''Melodic Table'' note-layout, and more rarely the ''Triad'' note-layout. It is related to the Wicki-Hayden based keyboards and other isomorphic keyboards, both of which can be utilized on the jammer keyboard musical interface.〔(What is the "Harmonic Table": how the C-Thru Axis works ), MusicScienceGuy.〕 == History == The structure and properties of the Harmonic Table have been well known since at least the 18th century. Indeed, as a pitch space, the Harmonic Table is topologically equivalent to Euler's Tonnetz, discovered by the Swiss mathematician Leonhard Euler in 1739. The two pitch arrays are trivially obtained from each other by direct shear mapping. This note layout created by Euler is utilised in Neo-Riemannian theory to geometrically model its musical ideas. The Harmonic Table keyboard layout was used in a keyboard harmonica called the Harmonetta,〔http://www.musanim.com/Harmonetta/〕 invented by Ernst Zacharias〔http://www.museumstuff.com/learn/topics/Ernst_Zacharias〕 and manufactured by Hohner from the early 1950s through the mid-1970s. A similar keyboard was developed by Larry Hanson 〔http://www.anaphoria.com/hanson.PDF〕 in 1942 for use with a 53 tone scale but turns the fifth sideways and the major third to the right and up. The modern layout was proposed in 1983 by inventor Peter Davies, who obtained an international patent for its use in instruments in 1990. Davies coined the term ''Melodic Table'' to refer to the layout. It was afterwards renamed to ''Harmonic Table'' by the first major manufacturer, C-Thru Music and publicized by the company. This layout is used in the sonome family of keyboards, currently commercially manufactured as the Axis and Opal keyboards. Keyboards using this layout can also be emulated on tablet computers like the iPad, such as in the app (Musix ). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Harmonic table note layout」の詳細全文を読む スポンサード リンク
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