Donated in the late fifteenth century to the papal choir, the musical manuscript "Cappella Sistina 14" reflects a new style of mass composition used by some of the era's most noted composers. "Masses for the Sistine Chapel" makes the complete contents of "Cappella Sistina 14" - held in the Vatican Library - available for the first time. Featuring fifteen masses and four mass fragments, this volume includes works by such composers as Guillaume Du Fay, Johannes Ockeghem, and Antoine Busnoys. In a comprehensive introduction and critical commentary on each work, Richard Sherr places the choirbook in its historical context, describing its physical makeup as well as the repertory. Sherr's critical edition of this celebrated manuscript finally provides the insight necessary to inform future performances and recordings of its influential contents.