P-Cug (Coimbra) Biblioteca Geral da Universidade MM 1063 (27) + MM 1063 (11)
The ordering of the images is based on the following reconstruction:
1063 (27) appears to have on the recto the responsory 'Sanctificamini' (007594) commonly sung on 'Vigilia Nat. Domini'. On the verso one can read the antiphon 'O rex gentium' (004078) sung after the same responsory in the source D-Sl : Cod.Bibl.fol.065 (see fol. 49r, https://dfg-viewer.de/show?tx_dlf%5Bdouble%5D=0&tx_dlf%5Bid%5D=http%3A%2...). To be fair, it must be said that the same antiphon is found in sources present in the Cantus Index in other liturgical occasions—in Advent and beyond. The identification of the 'recto' and 'verso' of this fragment may benefit from future research.
1063 (11): on the recto one can read the antiphon 'Vos ascendite' (005493) normally sung on the Tuesday of the 5th week of Lent (Fer. 3 de Passione). On the verso, the end of the responsory verse 'Erue a framea' (006395a) can be found, followed by the repetendum ('et a cornibus') and the rubric for a versicle. The fragment ends abruptly here, but the responsory verse 'Erue a framea' is commonly sung on the Sunday of the 5th week of Lent (dom. de Passione).
Library stamp ('Biblioteca geral') on the recto of both fragments. Here, one can read two remarkably similar later additions probably penciled by the same hand, identifying the book binding from where these fragments were detached ('João Duns Sloto [sic; for Scoto], Librum tertium sententiarum, Valentiae').
Small square notation written in brown ink on a four-line red stave. Custos on MM 1063 (11).