Is God so impotent that He literally cannot, as you would suggest, use any and every part of His creation, including all types of music, to His greater glory? Not even if the person writing and making it - as well as the person listening to it - desires it to be so, and finds that it lifts his or her mind and heart to God?
Well if you’re going to argue in principles like that: Let me put it this way, let’s take some rap song that encourages people towards impure acts, and contains blasphemies against God.
To God’s greater glory?
Just like the devil himself, ‘God can use it to His greater glory’ in a sense. But dancing with the devil isn’t likely to get you to that greater glory.
I don’t know where the boundary between good and evil lies precisely with such music. We can talk about tendencies… predispositions… associations… the fundamentals… other people know far more than I… .
But I submit to you this… We don’t get to Heaven by keeping the world and God at once, we get to Heaven by giving it all up for His sake.
In other words, someone who isn’t greatly interiorly reformed isn’t going to do well with these iffy issues and borderline stuff. He’s going to need to stand well clear of it to make progress.
Someone whose lived in it, -needs- to get out of it to get a clearer perspective, and do things differently.
A lot of people aren’t even willing to consider this stuff could more tend towards bad than good for them… they aren’t in touch with their interior lives and the difference in the interior life with different ways of living sufficiently to be able to understand this… and they’re not willing to try.
They see ‘rock music is bad’ and think of secular anti-religious stereotypes… which they feel justified in embracing… when the source of these is actually not of God.
LilyM, you know what I mean by ‘sacred’ music, I would think.

I would mean what the encyclicals mean. Gregorian chant primarily.