I Fiamminghi IV: O admirabile commercium. Brumel, Regis, Mouton, Josquin. Cappella Pratensis - Rebecca Stewart, Ricercar 207572
M264, M265 and M268 have further concordances in F-PN Cons. Rés. F. 41 (for the foliation, see the records of the individual motets). Because of its particular nature, this source (in which the motets are inserted as handwritten additions between printed masses by Carpentras) is not listed among the Other sources of the present cycle (see http://www.diamm.ac.uk/sources/2375/#/).
See information on this cycle as part of The Josquin Research Project.
The first half of the antiphon O admirabile commercium (Cantus ID 003985) is quoted in the T (passage: "O admirabile ... et procedens homo") and partially in the C (incipit):
1--efd-dc--f--f--fg--g--g--gf--gh---gf--f--f--gh--f--g--f--g--gh--f--f--4
"O admirabile commercium creator generis humani"
1--f--f--fhijh--g--j--h--g--f--f--g--f--f--4
"animatum corpus sumens de virgine"
1--g--f--f--fhij--h--g--g--g--gh--g--fg--f--4
"nasci dignatus est et procedens homo" (http://cantusindex.org/id/003985)
The next part of the antiphon O admirabile commercium (Cantus ID 003985) is quoted in the C (passage "sine semine")
1--fe--df--fg--fe--dc---4
"sine semine" (http://cantusindex.org/id/003985)
The last part of the antiphon O admirabile commercium (Cantus ID 003985) is quoted in the T (passage "largitus est" ... end)
1--cd--f--f--f--gh--g--h--hk--hg--h--f--f---4
"largitus est nobis suam deitatem" (http://cantusindex.org/id/003985)
Clefs vary in the sources.
See also The Josquin Research Project.