The Liber Usualis contains the complete Latin settings of Gregorian Chant for every Mass of the year (Sundays, Solemnities, Commons and Feasts) as well as for Nuptial Masses, Requiem Masses, Holy Week, and Ordination. Additionally it provides much of the Gregorian Chant to be sung in Latin for the Divine Office (Vespers, Compline, etc.), as well as many other traditional Latin chants and hymns (Litanies, Benediction, etc.). 1,900 pages.