Part 1, 14th century (fols. 1-52): Thomas Aquinas, Quaestiones quodlibetales Part 2, 14th century (fols. 53-56): Polyphonic secular and religious music Part 3, 12th century, late (fol. 57): Antiphonal (fragment) Part 4, 12th century, second half (fols. 58-73): fols. 66-73, 56-62. Ambrose, Letters and fols. 62va-65rb. Ambrose, De incarnationis dominicae…