In my opinion “jewish music” has to do with the content of the song. You could say that you are aloud to listen to any song ( even non jewish)as long as it is appropriate ( the topic and the voice) but you would surely come by a inappropriate song and “by mistake” listen to it And acually like it and then you would be hooked. thats why most people recommend only to listen to jewish music because then there is almost no chance that you would come upon a inappropriate song.
If you say that this day in age the jewish music is too rocky then suit yourself and dont listen to it. but dont go around and say that todays jewish music is not kosher. Because thats about the the music people like and these composers need to stay in buisness and instead criticizing all these artists and say thank you for making your music for us to enjoy.