Augustinus 
De Musica [PDF ebook] 

This is the first critical edition of all six books of Augustine’s
De musica. Originally meant as part of a series of treatises on the liberal arts, it is especially important because of its presentation of metrics. Book six offers a theological discussion of perception based on the concept of
numerus (’rhythm’). Thus,
De musica is a fascinating document of Augustine’s intellectual development from secular learning to Christian philosophy.

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