I think one thing we can agree upon is that there is nothing inherently “Jewish” about music ( I’m not talking about lyrics ). Music has always been a product of the surrounding culture that we’ve lived in. The music that many Litvaks would define as being Jewish( Eastern European based ) would be totally foriegn to my brother in law ( his family is from Iraq ) and my friends ( Bukharin Jews ). The Jewish music at their simchas is totally different than what we are used to but it doesn’t make it not Jewish.
Differnt generations have differnt tastes; it doesn’t make it right or wrong. I have a friend who lives in Har Nof and has been at chareidi weddings where the musicians are baale tshuva. Often times the people don’t realize that the tunes they are dancing to are taken from the band’s former life and applied to their current one. Good music is good music.