"None of this should imply that musicians a thousand years ago, and the people who heard them, could not enjoy their work sensuously. Indeed, Saint Augustine admits to just such an enjoyment of liturgical singing in his Confessions . And yet although he admits to it, he does not admit it. Recognizing that 'there are particular modes in song and in the voice, corresponding to my various emotions and able to stimulate them because of some mysterious relationship between the two,' he maintains a special guard 'not to allow my mind to be paralyzed by the gratification of my senses, which often leads it astray.' That ambivalence expressed by Saint Augustine in the fourth century, has remained a characteristic of Western religious thinking about music."
-from the Oxford History of Western Music, Volume 1 : Music from the Earliest Notations fo the Sixteenth Century. pg. 66.