Would you say that the German band Moskau’s song Genghis Khan is treif? How about even without the words? How about when it’s played at a chassidishe wedding with yiddish words dubbed over by MBD (who by the way is a great baal chesed)
The whole “issur” is ridiculous. We should avoid anything that is damaging to our avodas Hashem regardless of where it comes from.