if you like the clean amazing operatic sound, listen to Roy Khan from Kamelot. He's a trained opera singer. http://www.youtube.com/watch?v=LoiAFy38Bg4 => earlier Roy Khan era Kamelot live song. Probably from 1998 when he first joined. Not even close to his best, but still pretty good. http://www.kamelot.com/mp3/Ne_Pleure_Pas.mp3 => an outtake of a ballad in french.