This is on purpose. Kids can't like the same things as their parents. They have to look for things their parents are against to feel rebellious and independent. For my generation it was nu metal. My mother was used to nice, elegant men wearing suits and considered any artist with esthetics rougher then Julio Iglesias as 'not nice'. So we had Korn, Slipknot, Marilyn Manson and other weirdos. We had violence and gore to shock our parents and can't be shocked with that so kids today have overly 'erotic' artists like Cardy B. 'Look ma, I'm listening to an ex stripper. You don't like that, right?'. Musically our artists were too aggressive for our parents and kids today have rap which for me sounds simply boring. And that's fine, that's by design. If my generation was into those artists kids wouldn't like them. Of course the biggest artists are the ones that manage to span generations like Taylor Swift but that's for non-rebellious part of society that just likes things they already know.