Contains 83 anonymous works and pieces attributed here or in concordant sources to Basin, Bedingham, Dufay, Dunstable, Binchois, Braxatoris, Frye, Cornago, Domarto, Horlay, Legrano, Morton, Ockeghem, and Pullois.
Two Italian secular pieces listed in the index now missing from the manuscript.
Original manuscript held by the Escorial Real Biblioteca, shelf no. IV.a.24.
Census-catalogue of manuscript sources of polyphonic music 1400-1550, I, p. 211-212 (EscSL IV.a.24).
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