I was wondering what form of the breviary was used by the monks at Clear Creek Abbey and in Norcia. The “Monastic Diurnal” does not seem to contain the chants used by the monks and the “Liber Usualis” does not have most of the office for ferial days. Since these two communities celebrate in the Extraordinary form they also use the pre-Vatican II breviary. My guess is that they use the 1934 Antiphonale Monasticum, but I was not sure.
Any pre-Vatican II Benedictine community will be using the 1934 Antiphonale Monasticum, or in the case of Clear Creek, Antiphonale Solesmense since they are of the Solesmes congregation. The latter is very close to the 1934 AM, but with some of the propers for the congregation; it’s not widely available, I have a second hand one from the abbey, but the 1934 is still in print by Solesmes.
The Monastic Breviary is completely different from the pre-Vatican Roman Breviary. There will be little commonality between it and the Liber Usualis. Some of the antiphons might be the same, and the psalms will be the same, but the psalter distribution is completely different. The Roman Breviary as existed just prior to Vatican II dates from 1911, whereas the Monastic dates from the 6th century, and still exists in a version adapted to the post-Vatican II changes (liturgical year, etc.)
Note this applies to the daytime hours only. I’m not sure what is being used as a Nocturnale. For post-Vatican II however, you could follow along in the Psalterium Monasticum, but the psalms will be in the Neo-Vulgate. Same psalms and psalm schema though.
Many communities though, pray Vigils recto-tono so the Breviarum Monasticum might be used, which does not have music. Not sure where you could find one these days. One of the monks at our abbey gave a used set as a gift once. It is entirely in Latin.
