Utilissime musicales regule necessitate plaini cantus simplicis contrapuncti: rerum factarum tonozum vsualium: nec non artis accentuandi tam speculatiue practice: accriori lima mundate
A Latin music treatise printed in Paris around 1526 by François Regnault, attributed to Guillaume Guerson, teaching plainchant rules, counterpoint and accentuation for singers and students. The pictures show printed staff notation with square chant notes on red-ruled staves, decorated initials, and a woodcut hand diagram with Latin syllables around a border, offering a designer examples of early music typography and hand-drawn ornament.
