A mixed collection of liturgico-musical miscellanea written in 17 different hands. The leaves include additions and fill-ins and some were erased and re-written. The collection however is not apparently random, and seems to have been used as updates or additions to various sections of the liturgy. The geographical or religious context seems to be consistent. The book clearly originates from the convent of S Giuliana in Perugia, and various writings and other evidence identify the scribes of the codex as belonging to this convent or the associated Hermits of St Augustine. A note on 1r reads 'Revendissimi D. Gabr. Mariae Guastucii Abbatis S. Mariae Urani, Donum Bibliothecae Class, Anno MDCCLXXIV'. There are other factors that relate the book to Cistercian monasticism, not the least of which is an illuminated initial showing a nun praying dressed in the Cistercian habit (f. 7v). The section written by Onofrio concludes with a Benedicamus. Above the original square notation a hand, if not contemporary then soon after the original copying, added a second entry using solmisation syllables.
The style of the music is unusual and archaic, reminiscent of what might have been described in the Micrologus of Guido d'Arezzo, characterised by unisons, and fourths, and almost totally excluding thirds and fifths.
There are two other works where a second part has been added: a Kyrie on f. 14r and another Benedicamus on 24v.