In the Middle Ages the cost of binding books was a considerable part of the overall expense of creating a manuscript, so, rather than bind short works individually, several different works--having more or less in common with one another--would often be bound together. This volume, of only 80 leaves, contains a dozen texts, originally written as several different sections. A late medieval list of contents and press-mark on a flyleaf shows that it used to contain even more texts, and belonged to the library at the abbey of Bury St. Edmunds. The music on this page illustrates the relationships between musical notes of different value. At the left of the middle row, for example, it is shown that one square note (on the bottom stave) is equivalent to the three lozenge-shaped notes above, and each of these is equivalent to the two notes above them.