You may want the Liber Usualis.
leafletonline.com/Liber-Usuals-Gregorian-Chant/productinfo/10268/ for the hard copy.
musicasacra.com/pdf/liberusualis.pdf for the pdf file. it’s 115.32 Mb, took me about 13 mins to download with DSL.
This new English Edition of the Liber Usualis gives a brief summary of
the Rules for the proper execution and interpretation of the Vatican Edition of the
Roman Chant, according to the Solesmes Method.
The Vatican Edition contains the Official Musical Text. To ensure uniformity
in the rendering of the Chant of the Church, ecclesiastical legislation
provides that this musical text may be used " with the addition of the Solesmes
Rhythmic signs", as an aid.
The use of these signs is officially authorised by the Congregation of Rites.
Musicians, generally, have long since experienced the wisdom and even the
necessity of this official sanction to the Solesmes Method as the sure means to
secure a desired and uniform system of interpretation.
As in all Art-forms, so in Plainsong, rules are the outcome of a wide practical
experience, insight and research. The Rules presented here have been worked
out and co-ordinated by the Benedictine monks of the Solesmes Congregation.
Based as they are on the ancient Manuscript Records, which have been thoroughly
examined in their application to the Vatican text, those Rules have for some fifty
years proved their efficacy as a convincing guide to the proper unified execution
of the Gregorian melodies in the daily carrying out of the Liturgy by the monks
of Solesmes themselves.
Our Holy Father, Pope Pius XI, in an autograph letter to His Eminence
Cardinal Dubois, on the occasion of the Founding of the Gregorian Institute, at
Paris, in 1924, writes : " We commend you no less warmly for having secured
the services of these same Solesmes monks to teach in the Paris Institute;
since, on account of their perfect mastery of the subject, they interpret
Gregorian music with a finished perfection which leaves nothing to be
With this quotation of an august commendation, the present Edition is now
offered by the Solesmes monks, that the Roman Chant may be a profitable
instrument "capable of raising the mind to God, and better fitted than any
other to foster the piety of the Nations ".
This Edition with complete musical notation includes the following:
- The Kyriale with Cantus ad libitum.
- The Mass of the Sundays and Feasts including those of double rank
throughout the year, with Vespers and Compline for the same.
- Prime, Terce, Sext, None, for Sundays and Feasts of the First and Second
- Matins of Christmas, Easter, Pentecost, Corpus Christi; Lauds for Feasts
of the First Class.
- The Litanies: the Mass of Rogation Days, Ember Days, Easter and
Whitsun weeks; the Vigils of Christmas, Epiphany and Whitsun.
- The services of Ash Wednesday, the Triduum of Holy Week and
- The principal Votive Masses and the Offices for the Dead.
Rules for Interpretation
It must be clearly understood that in Plainsong the notation is not and was
never meant to indicate the absolute but only the relative pitch of the melodic
intervals. The two Clefs of Doh and Fah, and their different positions, have
no other aim than to make possible or easier the writing of the melodies on the
stave. Often these clefs could be interchanged, their positions could be different,
as, in fact, is the case in the Manuscripts of Plainsong. It must, therefore, be
well understood that the notes read on the stave are to be sung at the pitch which
is within the compass of the singers, according to the size of the building, and
the special character of the piece.