Le Guidon du plain-chant... par Jacques Doublet
Le Guidon du plain-chant by Jacques Doublet, printed in France in 1649 by G. Doublet, is a treatise on Gregorian plainsong teaching chant notation and solmization for singers. The pictures are small staff-and-note diagrams set among printed French text, with square neumes on four-line staves and solmization syllables such as ut, re, mi, fa, sol, la; a designer might borrow their stark black-and-cream rhythm of lines, blocks and aged paper texture.
