6-plus-6-instruments

6-plus-6-instruments are chromatic musical instruments.
Their keys or cords are in two rows. In each row the tone distance is a whole-tone distance.
The distance between both rows is a half-tone distance.
So there is the same fingering in all 6 scales where the base tone is in the same row.
If there is a third row, which is a repetition of the first row, there is the same fingering in all 12 scales, e. g. on a piano with a Jankó keyboard.
The 6-plus-6-system is the base of the musical princip of Johannes Beyreuther.
The following 6-plus-6-instruments are known:
Keyboard instruments
*Piano with the keyboard of Alfred Gould and Cyrus Marsh
*Piano with the Jankó keyboard
*Uniform Keyboard Accordion of John H. Reuther
String instruments
*Chromatic dulcimer
*Chromatic harp
Percussion instruments
*Glockenspiel
*Vibraphone
*Xylophone
Wind instruments
* Melodica
* Pan pipe
Electric instruments
* The Japanese electronic keyboard Chromatone
Instruments with a shifted 6-plus-6-system
The distance of both rows of these instruments are at least in one direction more than a half tone.
* Hayden-Duet-Concertina: Also here is the same fingering at all scales.
 
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