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scurrilous ones, the same people would have easily tolerated them, even if they illustrated the matter less effectively. Such is the world. What can you do? Whoever wishes to learn this art must attend not so much to the words as to the notes. What, therefore, does it matter to the subject what words are under the notes, provided that the notes demonstrate the mode and the nature of the song? But through the envy of an evil spirit, this was brought about, that a pious work might be suppressed under this pretext. Learn, therefore, best of youths, these things that have been hidden for more or less eight hundred years (although they were on everyone's lips), the true nature of the musical modes