<P> 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 . </P>
what is the first known polyphonic setting of all the sung movements of the mass ordinary
the Ivrea Codex the Apt Codex