The reason why very few people will never be convinced in the topic of non Jew music is that people are too emotionally invested in the music they enjoy. No amount of rational thinking can convince a person differently than they already feel or force a person to be objective.
Jewish is a birth status. It is not a description of a correct standard of behavior. There are plenty of irreligious ‘Jews’ with no concept of torah, who unfortunately promote immorality in this country. Therefore whoever said there is no such thing as Jewish music is correct, unless you want to say the cultural Jewish tunes like the old European ‘klesmer’ type of sound. However, this does not mean that there is no correct type of music for a Yarei Shamayim. It is for this reason that music is so relative to a person’s madreiga, and the madreiga they wish to be on. The music of a frum Yarei shamayim (Torah music – whatever you want to call it) is only music that uplifts and brings a person closer to Hashem. Period. It is this way with everything in life. Nothing deserves the brand of frum or torah status if it is not aimed to inspire. The majority of the so called mainstream “Jewish” music does not do that in fact it does basically the opposite – the composers try to capture the wild culture of the goyim, stick in a few Hebrew words and hide beneith the cover of ‘Jewish music.” There is a tremendous ta’ava for this – no question, just like other aspects of a secular society are appealing. There is a lot of neutral secular music out there like classical or some may argue disney or whatever, but the bottom line is, the second you start picking and choosing, chances are you will end up listening to wild, destructive songs as well. However, I truly believe parents need to teach that children that just because a frum Jew is singing it, it does not mean that it is good for your neshama. It is truly one of the challenges of this generation.