Two manuscripts from the 14th century, the Ivrea Codex and the Apt Codex, are the primary sources for polyphonic settings of the Ordinary. Stylistically these settings are similar to both motets and secular music of the time, with a three - voice texture dominated by the highest part. Most of this music was written or assembled at the papal court at Avignon.
what is the first known polyphonic setting of all the sung movements of the mass ordinary
the Ivrea Codex the Apt Codex