In the missal, the book for the celebrant of the Mass, various sizes and styles of scripts,
the color in which they were written,
music notation, and initials were carefully organized to define loudly proclaimed text, quietly
spoken text, chant sung by the priest, incipits of chant sung by the choir, the beginning and
hierarchy of texts and the beginning of new parts of the same text. In the
first printed missal, called either a Missale Romanum or a For a discussion of the design of the missal page, see Mary Kay Duggan, "The Design of the Early
Printed Missale," Journal of the Printing Historical Society, No. 22 (1993), 54-78.