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In Parncutt’s system the four lines are F, G, A, and B. The three spaces above and below the staff are C, D, and E. This aligns his staff with the familiar 7-5 pitch pattern so that the three spaces within the staff correspond to the group of three black keys on the piano (F#, G#, A#), and the two ledger lines correspond to the group of two black keys (C#, D#). Parncutt’s design was his modification of Albert Brennink’s design.
Earliest documentation: 1996
Source: Directory of Music Notation Proposals, section/page: 10/21, 11/3, 13/62