Identical to the regular five-line staff systems, except that the second and fourth lines are heavier than the other lines. As with most of these five-line systems, the single ledger line is C.
Earliest documentation: 1991
Source: Directory of Music Notation Proposals, section/page: 10/27, 11/3, 13/84
Manuscript Paper: Discontinuous Staves, Continuous Staves
