D-LEu Rep. I 93

Early tenth-century antiphoner, somehow connected with Regino of Prüm.
The manuscript consists of three parts:
1 texts on music theory (f. 4r-36v),
2 an appendix to a (non-extant) gradual (f. 36v-51v),
3 a monastic antiphoner (51v-147v, 3r-3v).
The parts are written continuosly by the same hand (as it seems), except for some additions at the end of the antiphoner.
Part 1 contains Regino's Epistola de armonica institutione, a shortened version of Regino's tonary and another tonary.
Part 2 contains the alleluia series for sundays, for the proprium de tempore and for the commune sanctorum, then a group of tracts that do not belong to the standard repertory, finally antiphons for the adoratio crucis and for processions.
Part 3 is introduced by the rubric "Incipit breuiarium nocturnale per circulum anni in laude dei canendum". Despite the designation "nocturnale" it is a full antiphoner; the designation "breuiarium" may indicate that the chants are not written in full. Normally each chant begins on a new line and is broken off at the end of the line. These text incipits, however, are given full musical notation (French adiastematic notation). Furthermore the mode of antiphons (except invitatories) and great responsories is indicated in the margin. There are several systems for the indication of mode:
a) abbreviations for the greek names (AP - authenticus protus, PP - plaga proti, AD - authenticus deuterus, PD plaga deuteri, AT - authenticus tritus, PT - plaga triti, AHT - authenticus tethrarchus, PHT - plaga tethrarchi) on f. 52r-109r;
b) roman numbers (I.To. etc.) on f. 52r-59v additionally to a) for responsories;
c) letters in place of numbers (A - 1, B - 2 etc.) on f. 100v-109r additionally to a).
All these systems can be found in this manuscript's version of Regino's tonary. Additionally the differentiae (here called divisiones) are indicated for the antiphons. They are largely congruent with Regino's tonary. From f. 109v there are no modal indications. Sometimes the modal indication for a responsory is contradicted by the notation of the responsory verse. In the index preference is given to the notation.

The date of the manuscript is usually given as beginning of the tenth century. Since Regino wrote his tract and tonary after 899, when he came from Prüm to Trier, the manuscript must be close to the author. Its place of origin cannot be determined. The clearest indicator is a charter on f. 1v-2v that deals with posessions in the region of Metz (see Bernhard, p. 13-15).

Selected bibliography: 

Michel Huglo. Les Tonaires: Inventaire, analyse, comparaison. Paris 1971.
Michael Bernhard. Studien zur Epistola de armonica institutione des Regino von Prüm. München 1979.