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In Brennink’s four-line-staff system the bottom line is F# so that the note A falls in the center of the staff.
Earliest documentation: 1976
Source: Directory of Music Notation Proposals, section/page: 10/2, 11/3, 13/2
Website: www.ab-chromatic-music-notation.com
Similar Notations: Untitled by Franz Grassl
Manuscript Paper: Discontinuous Staves Continuous Staves
