Oh!:(
Now one more question. Why did the people and the priests put up with it? I'm telling you, we'd lynch any priest who tried this and topple any bishop, metropolitan or even Patriarch. BTW, did you read where it seems the Patriarch of Jerusalem, an arch scoundrel if ever there was one, may well have been toppled himself by his brother bishops and the archmandrites out there? That's how we often deal with hierarchial dogs.
According to Thomas Day in "Why Catholics Can't Sing," this was not so much a revolution as an outworking of something that was already pretty badly broken. Day says that the Irish ran the show in American Catholicism (largely true) and they they were brought up with a certain suspicion of very elaborate church music because they associated it with Anglicanism during the penal years in Ireland. (When Anglicans had big stone churches with bells, pipe organs, and choirs, and Catholics met for Mass around large rocks in open fields.) Day's point is that, with rare exceptions (often involving German or Italian prelates or congregations), music in the American Catholic Church has never been especially dignified or noteworthy.
You also have to remember that the Tridentine Mass was not really a participatory experience for the laity -- it was a dialogue between the priest and the server (Low Mass) or between the priest and the choir (High Mass). Oddly enough, we've now come full circle, because most Catholic parishes have an overmiked cantor or two who do most of the singing; the people in the pews just sit there. When my previous parish went from more traditional fare to a tinkly piano player and bad contemporary hymnody, many of the people stopped singing. (Some of them, like me, just left another parish.)
Anyway, because of the non-participatory nature of things, people "put up with it" because it wasn't something they were really involved in in the first place.
Not all parishes use the missalettes exclusively. Parishes with good music use the Adoremus hymnal, or the Collegeville hymnal, or another one ... St. Michael (?).
Then there's the baleful influence of Oregon Catholic Press ... purveyor of the worst of the worst ...