Erlangen, Universitätsbibliothek, 473/4. Probably volume I of a set of four (originally seven) choirbooks of liturgical music. This volume contains music for Christmas, Easter, Ascension, Pentecost, Trinity, Corpus Christi, John the Baptist, Peter and Paul, Visitation, and Assumption.
Provenance: Copied by Johannes Härtung at the Cistercian monastery in Heilsbronn. Dated 1540 (excluding final piece, not by Isaac).
Published inventory: Franz Krautwurst. "Die Heilsbronner Chorbücher der Universitätsbibliothek Erlangen (Ms. 473, 1-4)." Jahrbuch für Fränkische Landesforschung 25 (1965): 273-324 and 27 (1967): 253-82.
Online copy: DIAMM (log in to view images)
Source of pieces in Choralis Constantinus II: The Erlangen sources, D-ERu 473/1, D-ERu 473/3, and D-ERu 473/4, have a number of correct readings where all sources deriving from Ott's print exemplar share common errors. These manuscripts must therefore have been based on Ott's original source, most likely Isaac's autograph. The proximity of Heilsbronn to Nuremberg may explain the early access of the monastery to a source in Nuremberg. The two pieces from Mass 8 that are also found in D-ERu 473/3 were apparently copied independently from the same exemplar.
Choralis Constantinus II contents:
- Mass 8
- Introit-Spiritus Domini (fol. 20v)
- Alleluia-Veni Sancte Spiritus (fol. 23v)
- Communion-Factus est repente (fol. 25v)
- Mass 10
- Introit-De ventre matris mei (fol. 42v)
- Alleluia-Inter natos (fol. 45v)
- Communion-Tu puer (fol. 47v)
- Mass 12
- Introit-Nunc scio vere (fol. 49v)
- Alleluia-Tu es Petrus (fol. 52v)
- Communion-Tu es Petrus (fol. 55v)
- Mass 13
- Introit-Gaudeamus omnes (fol. 56v)
- Alleluia-Magnificat (fol. 59v)
- Communion-Beata viscera (fol. 63v)
Character of variants in Choralis Constantinus II repertoire:
The versions of the Choralis II pieces differ significantly from the print only in their more accurate readings.