The Segovia Manuscript (Cathedral of Segovia, Archivo Capitular) has puzzled musicologists ever since its rediscovery at the beginning of the twentieth century. It is unique: no other manuscript of the period transmits a comparable blend of late fifteenth-century music, consisting of 204 sacred works and vernacular pieces in Flemish, French, Italian, and Spanish. An important group of pedagogical pieces by French and Flemish composers may preserve...