Historical Arrangement of the Mass Ordinary and Franciscan Contributions

How did we end up with a Kyriale in the Graduale Romanum, with its 18 Masses, group of Credos, and ad libitum section? Find out the specifics, as well as the general trends and conditions that brought about this organization in the liturgy. 

Find out more about Dr. Andrew Kirkman and his work here: https://www.birmingham.ac.uk/staff/profiles/music/kirkman-andrew

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