Nightwish.
I don’t even really like them but they were hugely important to stupid 13 year old me because it was among the first stuff I dared listen to on my own accord since my dad were such a music snob back then, so it’s got that first-crush kinda core memory.
It’s particularly this one live version too which I found a few years ago that kinda reminded me they exist:
Their most recent singer, Floor, is way better than Tarja or Anette.