A Gradual (or graduale) is a book which contains the chants sung during the Mass. It includes the music notation together with the words. Like the Breviary, it is divided into distinct parts according to the two main cycles of the liturgical year, which contain respectively all the parts of the liturgy which vary in accordance to a specific observance (proprium de tempore, 'proper of time' and proprium santorum, 'proper of saints') and those which are common to a specific category of saints, such as martyrs, confessors, virgins and so on (commune sanctorum, 'common of saints').

Each celebration includes different chants: the Introitus (the entrance chant, sung when the priest apporaches the altar); the Gradual Psalm (a responsorial chant which follows the reading of an epistle or other lection); the Alleluia; and the Sequence (sung before the reading of the Gospel; on certain occasions, such as during Lent, a Tract, a series of psalm verses, is sung instead of the Alleluia); the Offertory (sung during the offering of bread and wine at the Eucharist); the Communion (sung during the distribution of the Eucharist).

Proprium de tempore (Advent to Easter): starts on f. 1r. The 'proper of time' (or temporale) includes all the chants related to the moveable feasts of the year. The liturgical cycle begins with Advent and ends with Trinitytyde (the longest season, from the first Sunday after Pentecost to the first Sunday of Advent).

Inserted between ff. 6 and 7 is a slip of vellum containing what looks like a different musical notation for the tract of the fourth Saturday of Advent (f. 7r). There are later notes in Dutch containing instructions on the chants to execute pasted on the margins of f. 17v and 91r.

After f. 61, four folios have been added. They containg songs for Easter and in particular a number of versions of the Alleluia. Some of the explanatory rubrics are in Dutch: Allelüias tüsschen paschen en pinsteren, 'Alleluia between Easter and Pentecost' (on f. 61^br); and Nae pinsteren, 'after Pentecost' (on f. 61^cr ). These are followed by the Credo Cardinale, beginning with the words Patrem omnipotentem factorem celi (f. 61^d), also known as Credo IV.

The same hand that has written the pages inserted after f. 61 has added an Alleluia and versicle for Saint Ursula at the end of this section, on f. 91v).

Proprium Sanctorum: starts on f. 92r. The 'proper of saints' (or sanctorale) includes all the chants for the feasts dedicated to specific saints; they are fixed feasts, as they fall on the same date every year. In this manuscript, alleluias and versicles following the Use of Rome have been written over erasures for Saint Paul (ff. 92v-93r), Saint Philip and Saint James (f. 96r), the Finding of the Cross (f. 97r), Saint Agnes (ff. 97v-98r), the Visitation and Saint Martin (ff. 105v-106r).

In Dedicatione Ecclesia: starts on f. 107r with the words Terribilis est locus iste. It is the service performed on the anniversary of the dedication of a specific church. Alleluias and versicle following the Use of Rome have been written over erasures for All Saints (f. 108r) and added for Saint Agnes, Saint Barbara and Saint Katherine (f. 108v).

Commune Sanctorum: starts on f. 109r. The 'common of saints' contains the chants which pertain to an entire categories of saints, such as martyrs, apostles, confessors, virgins, and so on.).

Votive Masses: start on f. 133r. The Mass for the Dead has been written according to the Use of Rome over an erasure (ff. 136r-136v).

Ordinary of the Mass: starts on f. 136v. The ordinary indicates those parts of the Mass which are invariable: with regards to the chats, these are the Kyrie, Gloria, Credo, Sanctus and Hosanna, Agnus Dei, Ite, missa est. The musical settings have interlinear rubrics which distinguish parts for choor ('choir') and orgel ('organ'). Further rubrics on the margins signal occasions for use of the different musical settings.

Sequences: start on f. 143v. The sequence is the hymn sung just before the reading of the Gospel. This manuscripts includes sequences dedicated to Saint Agnes, Saint Monica, Saint Anne, the Nativity and Octave of Saint Augustine, Saint Michael, Octave of Saint Michael, the Translation of the relics of Saint Augustine, Saint Ursula, Saint Martin and Saint Elizabeth.

Later additions: start on f. 176r. These have been executed by the same hand who is responsible for the other additions throughout the manuscript. The original foliation starts once again from 1. The additions consist of: two more sequences, dedicated to the dead (Dies Irae and Audi tellus audi magni maris nimbus; ff. 176r-177v); an anthem for the blessing of the candles at on Candlemas day (Lumen ad revelacionem gencium et gloriam plebis; ff. 177v-178v); the Sanctus and Agnus Dei for Virgins and Apostles, an additional Alleluia and other chants with marginal references, all according to the Use of Rome (ff 178v-180r); part of the Benedictio et Consecratio Virginum (Veni creator spiritus), not according to the Use of Rome (ff. 180v-182r). The last additiona are the hymn Kyrie fons bonitatis and a Credo (ff. 183r-184v); these have been executed on paper on a even later date.

Apart from the last two pages, two hands are distinctly indicated, both good, uniform Gothic. The first is responsible for the main portions of the manuscript, the second for whole folios occasionally inserted, and for the replacing of the original text in places. The Dutch rubrics are by the second hand, which can very readily be distinguished by the particularly black, lustrous ink used.

The ordinary capitals are of two types: Gothic line initials with penwork ornament, and plain blue and red verse initials. There are also three types of illuminated initials: blue and white, filled and surrounded by penwork in red and pale green; large initials floriated in colour, blue, lake, vermilion, and green, on burnished gold grounds (very characteristically Dutch); and historiated initials. The last two types are combined with magnificent borders of wild flowers and fruit, beasts, birds, snails, butterflies, and grotesques, etc., with acanthus scrolls, gold roundels, and delicate gold scroll work on the plain vellum. Some of the grotesques are interesting. On f. 1r, two monkeys winding wool on a winder; f. 10v, a man playing bagpipes; on f. 107r, a bird in a cage with bath beside it, and a pig wheeling a roller.

Miniatures (in initials):