That's disengenious - she is talking music styles, and you ask if God would use specific songs.
I don't see why someone couldn't do a song, with either a christian message, or christian viewpoint with a music style like AC/DC...
Why is it disengenious to cite specific songs as representing a style of music?
I asked her if there was ANY music she thought was not appropriate to represent the Gospel message.
She responded that she thought NO style of music could be excluded.
The examples of music I gave are NOT excluded from ANY style of music.