FuturePotus- From what R’ Matisyahu wrote, it didn’t sound like he thought it was a problem. He wrote that it’s only the words of goyish music that is a problem, not the music.
He then does go on to make some negative comments about certain types of music, but I don’t remember exactly what he wrote (but he definitely didn’t say assur).
Personally, I don’t see anything wrong with it, but it may be a sensitivity issue and perhaps I’m not on the level to see why it’s a problem. But I do think that it is the kind of thing that you can’t say that someone else is doing something wrong even if you feel that it is not appropriate for yourself.