Niemand
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I read the entire thread (and didn't even get lazy!) and downloaded several works by the group being discussed here. I listened to them. My impression is mixed: Tarja Turunen is, of course, not Montserrat Caballé, but she also sings quite well. However, in my opinion, her vocals don't quite fit with the music played by the rest of the band. And in this regard, Anette Olzon's voice sounds better (or is more pleasant, I don't know). IMHO.