I am doing some research currently and see that the online CMAA archives of Caecilia and Sacred Music have a gap from 1965 to 1975. Interestingly, I heard this approximate time called the "decade of darkness" in a lecture this morning! Was anything published by this organization during these 10 years? It would be remarkable to read commentaries on the developments of these 10 years, which include Musicam Sacram, the GIRM, Music in Catholic Worship, etc.