This edition comprises 1,662 trope units and is based on 134 manuscripts written throughout Europe, the majority dating from the tenth through the twelfth centuries, but some even later. Volume A contains a general introduction explaining the principles of the edition and analyzing various problems. The feasts and the calendar as well as the antiphons are discussed. Volume B contains the proper edition: the Latin trope texts of Saints appear as elements in alphabetical order, with an apparatus showing all the variant readings, with cross references to tropes, with parallel passsages, above all scriptural and liturgical ones, and with references to extant published editions.