From the Credo section of a manuscript of English polyphonic music. Each of the pages bears part of a different anonymous Credo; therefore neither side of the bifolio was originally a centre gathering. Two of the Credos have concordances with known compositions, supplying attributions: one to Dunstaple, the other to 'Anglicanus'. The Credos on ff. Ar and Av were first recognised by Peter Wright (2010) as concordant with settings elsewhere ascribed to Dunstaple and Anglicanus.

F. Ar Anglicanus, Credo Alma redemptoris mater (= Curtis & Wathey, Credo 70: Tr92-1, 113v-114). Second cantus part, starting at Et in spiritum (telescoped text in both sources), with 2-stave indentation for initial E, not provided. In imperfect time, major prolation, changing to minor prolation at Et unam.

f. Av Dunstaple, Credo, upper part (= Curtis & Wathey, Credo 55, = Ao 15, 135v-138). Published in John Dunstable: Complete Works, ed. Manfred F. Bukofzer; 2nd, rev. ed. Margaret Bent, Ian Bent and Brian Trowell. Musica Britannica, vol. 8. (London, 1970), no. 5. Text differently distributed. First section to facta sunt, in imperfect time, minor prolation. From Et incarnatus, the English source notates in imperfect time, minor prolation, from Qui propter, Aosta notates in perfect time minor prolation, in augmented values with Ø.

f. Br Credo, hitherto unidentified. Second cantus part, texted, in imperfect time, major prolation, with 2-stave indentation for initial P, not provided.

f. Bv Credo, hitherto unidentified. Upper part, in imperfect time, major prolation.

Full black with red coloration.

Spacing suggests pages were ruled with 12 red staves (of which only the upper 7 survive); each Credo probably occupied a single opening, as in Old Hall (Lbl 57950)

The numbering of the folios (A as the wider leaf and B the smaller) is provisional, as it is not entirely clear which way the bifolio was originally folded

Parchment