What is 6-plus-6-instruments?
[[Image:MIM Janko Piano.jpg|thumb|upright=1.7|right|250px|A Janko keyboard.]]{{No sources|date=May 2020}} '''6-plus-6-instruments''' are musical instruments having each 12 tones. Their keys or cords are in two rows. In each row the tone distance is a [[Whole-tone scale|whole-tone]] distance. The distance between both rows is a [[semitone|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 the same like the first row, there is the same fingering in all 12 scales, e. g. on a piano with a [[Janko keyboard]]. [[Category:Musical instruments]]