i noticed since other people were wondering about how mikael can growl and sing clean.... welll its very simple.... i am a vocalist this is what i did... i screamed alot...screamed screamed screamed fucking like a maniac.... eventually... i could scream all day long and my throat would not be sore 1 bit... enabling me to sing any clean vocals...... so when i play live with my band i can scream and then when we have clean parts i dont hav eto worry about my throat...... i cant see another method of singing and creaming.... maybe mikael does do something different but i doubt it... it sall about practice