This codex can be dated to the 10th century; it contains the Musica
enchiriadis (2-27), a 9th century music theory treatise which
endeavors to develop a series of rules for polyphonic composition,
as well as annotations to the commentary Scolica enchiriadis
(27-45, 66-102). Dasian notation is used in order to graphically
illustrate the music. For a long time, this treatise was attributed
to the monk Hucbald, but today it is considered the work of an
anonymous author.