I understand that the old Scottish Calvanists, (and maybe the present "wee Frees" as they are called) disapproved of singing anything but Psalms. Hymns - ancient or modern - were a no-no. Yet the Psalms themselves were once "Top of the Pops" - David was a bit of a pop star himself! And our old hymns and choruses were modern once; some have a lively dance beat that set one's toes a-tapping. There are some wonderful modern hymns too.
As I said, its a matter for discerning the spirit of the music, not only the words, or whether it attracts young people. We don't have to be "old-fashioned fuddy-duddys to be able to say that certain music is evil.
I'm convinced that much modern Rock music, (especially of the "heavy metal" kind) including "Christian" rock, is literally demonic. There's the (supposedly true) story of some Christian young people who were on a mission (to Africa?). They were playing some "Christian Rock" music when the local witchdoctor passed by.
He became annoyed and confronted them, complaining that it was his business summoning the spirits, not theirs, so why were they playing that music?
A musician once told me that one of the characteristics of this kind of music was something to do with the emphasis being on the second beat of the bar, rather than the first; though not being musical I'm not quite sure what that means in practice.
Don't know if any of this helps, but folks are praying...
Jeannette