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A heavy line represents D. Three ordinary staff lines represent the group of three black keys on the piano (F#, G# and A#). The distance between the D line and the group of three lines is twice the distance between adjacent lines in the group of three. Black noteheads are used for the whole-note scale that includes the lines, and white noteheads for the other whole-tone scale. The rhythmic notation is proportional. The line pattern and rhythmic notation make it resemble a horizontal 6-6 version of Klavar notation. As in Klavar, the noteheads are actually circular (not oval as depicted here), and white and black noteheads are always placed on opposite sides of the stem.
Earliest documentation: 1952
Source: Directory of Music Notation Proposals, section/page: 10/35, 11/2, 13/103
Similar notations: Klavar, Mirck Version, 6-6 Klavar by Cornelis Pot, Klavar, Dekker Version by Antoon Dekker
Miscellaneous examples: Major Scale Comparison Triad Comparison Jazz Chords Comparison
Manuscript paper: Discontinuous Staves Continuous Staves Piano Staves