This stuff was in the hymnal then. The Monthly Missalette had basic notation in it. I took lessons from age 6, I could read the music.
The “parish music minister” (for about 15-20 years running) was a Protestant organist. In those days he was called “the organist.” There wasn’t a “music ministry”. The choir director was called “the choir director.”
Re the old settings, I suspect the basic settings we used at my church growing up were pre-revision versions of either Proulx’ “People’s Mass” or Alstott’s “Heritage Mass”, both of which have been revised post-2010 in a way to make them nearly unrecognizable. I could sing you the old settings if you were sitting here as they were very simple (the congregation was expected to sing along, and did back then) and I heard them probably several hundred times. They were all in 4/4 time and in a major key. Minor key at Mass was rarely used unless it was something special for doomy Lent.
I cannot find the choral Gloria. It was the pre-2010 version that had men’s and women’s voices alternating and just prior to “With the Holy Spirit, in the glory of God, Alleluia” they’d have the men singing the line and the women chiming in with “Glory to God”. Then at the end the men would be singing "Glory to God in the highest…"while the women sang over that “Glooooooo-reeeeee, glo-ry, glo-ry”. Once again if you were sitting here I could sing it for you. We sang it in junior high choir as well as hearing the adult choir sing it.