Keyboard for use in key instrument for playing modified notation, has black key provided between two white keys that are arranged next to each other, and one of white keys and nearest black key always distinguishable by half note

摘要

The keyboard (1) has a black key (4) provided between two white keys (2) that are arranged next to each other. The white keys and the black key are assigned to notes. The white keys are arranged next to each other and are always distinguishable by a whole note. One of the white keys and the nearest black key are always distinguishable by a half note. Two white keys are arranged at a distance from each other.