These four folios preserved in the Douai library contains fragments from a fourteenth-century music manuscript: one Gloria, two incomplete motets and two complete motets, all of them unica, with the exception of Multipliciter amando preserved in F-CH MS 564. Music, notated in black full mensural notation (with red coloration), is laid out in choirbook format. No information is known about the host volume(s) in which they were used as binding material.
Folio 1r: most likely the motetus of an incomplete Latin motet in praise of St John the Baptist. The melody is divided into two rhythmic patterns repeated three times each; the different mensurations of the two rhythmic patterns can be understood as a 2:1 diminution.
1v-2r: 3vv Latin motet with isorhythmic tenor on “Letificat iuventutem meam” with periodic upper-voice structure. Motetus on folio 2r is barely legible. Concordance in F-CH MS 564 (Chantilly codex).
2v-3r: 3vv, troped, Et in terra pax (Gloria) with a long melismatic “Amen” (47 perfect breves). The three voices are texted.
3v-4r: 4vv Latin motet with a solus tenor, with tenor “Ave Maria” (CAO 1539). Lower voices are homographic and alternate black and red notation; their mensuration and proportions are given in a Latin canon on folio 4r. The name of the composer, Frater Johannes Vavassoris, is encoded as an acrostic in the triplum text. The motetus text encodes the date of composition as an acrostic: 1373. The motetus text also encodes the “Ave Maria” prayer of the tenor as a telestic.
4v: most likely the triplum of an incomplete Latin motet in praise of St Lambert of Maastricht; ‘Sanctus Lambertus’ is quoted by an acrostic in the text.