Mannerist artists broke many of the artistic rules that high renaissance artists adhered to such as:

This is an easy question this is how i answered itArtist's ability to convey LIGHT (and shadow) further enhances the illusion of three- M broke withmany contemporaries in underplaying the value of math and ... the "rules"(the right to self-expression limited only by the artist's own judgment) Unlike the High Renaissance patronage of the papacy,many Mannerist works ... and that is my answer

The gregorian chant was a major cultural milestone in the middle ages. it was one of the first codified forms of music meant to be played as written, where previously it was difficult to mass-produce and disseminate any music. what's more, these chants were also some of the first examples of musical notation: the notes and bars of today's music sheets are a reflection of centuries of evolution beginning with these chants. it became official throughout the entirety of the catholic church, meaning that nearly all of europe followed this musical notation and styling.