SYLLABLE-BASED MODEL OF MAJOR-MINOR KEY SYSTEM Russian patent published in 1999 - IPC

FIELD: musical instruments. SUBSTANCE: device has grid, which is split into major and minor key fields by central vertical line, and into upper sharp-key and lower flat-key fields by central horizontal line. Second claim of invention discloses device design in which each of major and minor key fields has at least one sharp-key and one flat-key fields corresponding to first circle of fourths-fifths. Each line contains name of key with at least one of respective alternated sound. EFFECT: facilitated understanding, simplified design. 19, 6 dwg