"By the end of the fifteenth century five different kinds of music notation had been cut into type. So far as we know, they first appeared in the books listed below:
"1. Gothic plainchant
"2. Roman plainchant
"3. Ambrosian plainchant
1482 Missale Ambrosianum, Milan, Christoph Valdarfer.
"4. White mensural notation
1480 Niger, Grammatica, Venice,Theodor Franck of Würzburg for Johann Santritter.
"5. Black mensural notation
 Graduale, [Basel, Michael Wenssler and Jacob de Kilchen].
"A sixth notation, tablature, would be added by Octaviano Petrucci in the first decade of the sixteenth century" (Duggan, Italian Music Incunabula. Printers and Type  14).