...it may be beneficial to uncover the reasons that inform your pastor's reticence about increasing the number of sung Masses, insistence on seasonal choir breaks, etc. That may help determine how best to approach him...
I don't even care if the people in pews sing heartily - I think that can be a good thing, but is difficult to build up to and has its drawbacks
Not until VII had authorised changes to the Mass was there the 1965 revision to the rubrics, which does impilicitly accept the primacy of Solemn Mass.De musica sacra et sacra liturgia Cong. for Rites – Feast of Saint Pius X – 1955
Musicae Sacrae Disciplina (Encyclical) Pope Pius XII – 1955
Mediator Dei (Encyclical) Pope Pius XII –1947
Mystici Corporis (Encyclical) Pope Pius XII– 1943
Divini Cultus (Apostolic Constitution) Pope Pius XI– 1928
Tra le Sollecitudini (motu proprio) Pope Saint Pius X –1903
That being said, if you're in an FSSP parish then I'm not sure how much this would matter; I'm in a typical OF parish and I imagine the people singing is viewed differently.
This is not only sound from a theological perspective but a practical one; it sacramentalizes the dialogue between Christ and his Church, and is the simplest, most repetitive music. It's actually imperative the people sing these things themselves...
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