A small vellum leaf from a Spanish Processional. The pinpricks used to align the text are visible in the margin. Both side include several red initials. The text is part of a song for Saint Katherina. The book containing the principal music sung by the choir during the Divine Office was called an Antiphoner or Gradual. This very large book was boldly written so that several people could see the text at the same time. In processions, smaller books were used for each member of the procession.