Writing in his catalogue Les Manuscrits du Processionnal, Michel Huglo described the processional as ‘pas un livre “officiel”, mais un livre créé par les chantres pour leur usage personnel’. In proposing a category of ‘personal’ as opposed to ‘official’ for the description of a book, Huglo alludes to a larger body of material support for musical practice: the description ‘personal’ can be applied to a larger field of books for the use of cantors (tropers, sequentiaries, collections of polyphony). This paper focusses on the process of codification of processional chants in particular, using as starting points two fragments from eastern Switzerland. Sankt Gallen, Stiftsbibliothek, 18, pp. 21–40 consists of a full gathering containing processional chants, while a more unusual example, Müstair, Benediktinerinnenkloster St. Johann, XX/48 no. 14, consists of three folios containing processional chants mixed with incipits for chants of the Mass and the office.