Can I ask for your music style preferences? ER4XR + ES100 leads me to think that you listen to no hard rock or metal using that combo?
i listen to almost anything really. does something like Tool hard rock enough?
i never see an earphone as specific for some music only. i see it like different camera filters or lenses: you might like it for some things, but basically you can use it for everything, depending on your mood at that particular day