Work commenced at the end of the seventh century with introits
, graduals, offertories, and communions, resulting in a nearly perfect set for the Advent-Christmas season.
The Roman Gradual (1737) contains two liturgical texts which display this feature of Jacobite subtexting, the introits
for the Second Sunday of Advent and the Vigil of the Nativity of our Lord, both of which are headed by an ornament blazoned with Jacobite symbols (shown in illus.4 and 5 respectively).
The second, third, and seventh essays ("Formulas that Interrelate Chants of Different Genres and Modes"; "Formulaic Usage in Melismatic Chants: A Chronological Approach to Second-Mode Tracts"; and "Formulaic Usage among Neumatic Chants: The Construction of Gregorian Introits
") concern relatively circumscribed segments of the Gregorian repertory and consider the role of formulas in them.
In the Gregorian introits
, for example, he sees "a brief glimpse of the schola cantorum at work on the introit
163) and alludes to the great number of Gregorian chant introits
that open with the same pitches.
These manuscripts contain tropes, sequences (both with and without text), verses for Introits
and Communions (including many interesting versus ad repetendum), chants of the Mass Ordinary with Greek texts, and various other items.