Bad taste has, however, degraded even religious worship, bringing into the presence of God, into the recesses of the sanctuary a kind of luxurious and lascivious singing, full of ostentation, which with feminine modulation astonishes and enervates the souls of the hearers. When you hear the soft harmonies of the various singers, some taking high and others low parts, some singing in advance, some following in the rear, others with pauses and interludes, you would think yourself listening to a concert of sirens rather than men, and wonder at the powers of voices … whatever is most tuneful among birds, could not equal. Such is the facility of running up and down the scale; so wonderful the shortening or multiplying of notes, the repetition of the phrases, or their emphatic utterance: the treble and shrill notes are so mingled with tenor and bass, that the ears lost their power of judging. When this goes to excess it is more fitted to excite lust than devotion; but if it is kept in the limits of moderation, it drives away care from the soul and the solicitudes of life, confers joy and peace and exultation in God, and transports the soul to the society of angels
Policraticus, John of Salisbury
Alleluia nativitas, Perotin
