A bifolio that served as a pastedown in a book containing the Cathedral's altar and choir consuetudines. Now separated from the covers, but preserved in the original book as a flyleaf.
One piece is concordant with a hitherto-unidentified musical example quoted in the treatise De musica mensurata (1279) from St Emmeram.
Discovered in the autumn of 2011 by Santiago Ruiz Torres and Juan Pablo Rubio Sadia.