P-EVp (Évora) Biblioteca Pública Pasta 3, doc. 001
Two night responsories for the Holy Week followed by Passion Sunday Lauds antiphons.
In pencil by a 20th c. (?) librarian, on recto top-right corner (probably the identity of the book from whose binding this fragment was detached):
Orthodoxarum explicationum /Libri decem ... / por Diogo Paiva de Andrade - Venezia, 1564
The responsory verse Retribuentes mihi is of some interest for its rarity, as it is only found elsewhere in Toledo 44.1 and P-BR Ms 032 (NB: the 3rd mode attributed in Cantus Database to Toledo 44.1 is wrong, the melody being the same as in this fragment and in the Braga manuscript).
Aquitanian notation of the Portuguese variety. Clearly recognizable lozenges consistently indicate the position of the semitones.
A later hand wrote letter-clefs on staves at the beginning of each chant, as well as vertical lines across portions of the music (the latter barely visible on the recto side of the folio).