I heard no one talk about Nusach Hatefillah and its importance. If parents and teachers taught this subject in school we’d have young men that know how to daven properly. Instead they listen to what’s on the Jewish stations and use these tunes for tefillos like Kedusha and Hallel. It’s like going to a Carlebach concert during Kedusha. It makes the tefillah mundane and not rich and filled with malchus. I personally don’t mind people listening for enjoyment any type of music they enjoy outside of tefillah, but don’t bring that stuff into shul!