Who is your favorite vocalist?

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Whick vocalist do you prefer and why? Which song is his/her biggest achievement (vocals considered, not music). What quality of that singer do you like? I personally like Rob Halford, hes got that extreme high tune in his voice, his screaming is endless and hes a true Metal God! His best achievement, of course Painkiller, a song which runs at super duper high speeds and with high pitched vocals allover it.I also like Gillan (Child In Time of course!), Matt Barlow, ex-Iced earth singer (at A Question Of Heaven)and Paul Dianno, when he was at maiden, because he had that nice rough vocals that you expect from a true rocker! i would be glad to see your opinion on the matter!