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So it sounds to me you are saying is that it isn’t the Jewishness or the non-Jewishness that really makes a difference to you, but the genre, e.g. heavy metal or rap. I presume it’s the wildness of those genres that bother you.
Without arguing with you about that yet, I am perplexed. If that is the case, why then are you opposed to Jewish songs that have their source in non-Jewish ones? If the song sounds nice it shouldn’t bother you regardless of who composed the tune, and if it doesn’t who cares who made it up? Why the witch hunt?
According to your explanation, it would make sense for you to tell the band playing at your wedding not to play wild songs, ones that imitate the styles of hip-hop and heavy metal, but what reason would you have to be makpid on songs with a Jewish source specifically?
Furthermore, I disagree with you even with regard to these genres. What makes a lot of this music despicable to my ears is the lyrics and the tone of voice of the singers, NOT the actual song. I am no ignoramus either when it comes to knowledge of various genres of music (not that there’s something wrong with someone who is) and I can say there certainly are tunes that I actually think are very nice in both of the genres you specified. It’s the words that make many of them them disgusting and bad, but that doesn’t ‘passel’ the tune.
‘Wild’ music is not inherently bad. When it is contained, there is a time and place for it. Whether for some on Purim, or just someone who is in a mood that needs uplifting and can’t deal with cheesy old European style music, (I’m not making fun, these are just feelings commonly felt when one is in that kind of mood) some times people just need to let go. In the proper context, even such music has its place. Though obviously only if the words are ‘kosher’. That is my opinion.