Funny, I like Ronan’s voice on everything through FuturePerfect when he wasn’t so much singing as much as…I don’t know…saying things melodically?
As for my own list, idk….. Bjork for sure, Tom Jones, definitely modern country singers, Cookie Monster vocals just sound incredibly stupid and cringeworthy (and not in a cool way), and this one will probably get me some hate, but Kate Bush’s voice on some recordings makes me want to stick a fork through my own ear drums.