Via retta della voce corale
A 1671 Italian treatise published in Bologna by G. Monti, written by Giulio Cesare Marinelli as a practical guide to singing Gregorian chant. Its pictures are printed musical staves with solmization syllables (do, re, mi, fa, sol, la) and note letters, showing how voice-pitch relationships are mapped across lines and spaces, which a designer could use for historic music notation, ornamental staff-line layouts, or diagrammatic tables.
