The chansonnier held by the Biblioteca Casanatense in Rome, designated Codex 2856 (0. V. 208), is a handsome volume containing 123 polyphonic compositions in the style of the Franco-Flemish School, circa 1450 to 1400. Although no text beyond the incipit is found in the manuscript, the value of the source is enhanced by the names of the composers of 106 of the compositions. Volume one focuses on the manuscript, giving a physical description of the manuscript, recounting the history of the manuscript, and includes discussion of selected composers and a concordance. Volume two contains the music of the chansonnier Biblioteca casanatense 2856.