Tongeren (close to Maastricht and Aachen) was an episcopal see until the 4th century, when the see was moved to Maastricht, probably under Bishop Servatius. In the 7th century it was moved to Liège.
The two volumes were written in the same hand and are largely identical in terms of content; they were perhaps intended for use by opposite sides of the choir.
In the ferial Office, there are a number of antiphons which end on the reciting tone of the psalm, as indicated in the differentia. For these antiphons, the letter-name of the final is included in the second column of the mode field. The mode number given in the first column is that associated with the differentia elsewhere in the manuscript.
Full invitatory tones are only found in the Invitatoriale of MS 63. Elsewhere in the manuscripts, only incipits of tones are indicated, as is the standard practice. The incipits for CH and GR are identical. Throughout the indices of Tongeren 63 and 64, this incipit has been labelled CH when found with invitatory antiphons whose first musical phrase is the same as the end of the CH tone (i.e. only the antiphons used during Christmas and Epiphany, cao1055 and cao1054). All other instances of this incipit have been labelled GR.
Any non-CAO chants also found in Den Hagg, Koninklijke Bibliotheek, 70 E 4 Fragmenta Tungrensia are given the same identification numbers in the Tongres files, since these manuscripts all represent the liturgy of the same church. Similarly, the differentia codes used for Den Haag are consistent with those of the Tongres 63 and 64; the differentiae are labelled with a letter-number combination (the letter indicates the final pitch of the differentia, and the number is arbitrarily assigned).
For the most part, marginalia in later hands have not been entered into the indices. However, included are a few additions in hands approximating the gothic style of the original layer of scribal activity. Such entries are marked in the “Marginalia” field.
- Corswarem, P. de. De liturgische boeken der kollegiale kerk van O.L.Vr. van Tongeren voor het Concilie van Trente (Gent 1923). [In this source, the old shelf-numbers of these manuscripts are used; ms 63: olim nr 4, pp. 55-58; ms 64: olim nr 5, pp. 55-59.]