yeah, roger has an amazingly unique, sexy, cold, voice, and no, Roger should have sung thoes songs like he did, I can't imagine dave singing thoes songs...NO BLOODY WAY! I mean, could you imagine Dave singing pigs? or sheep? I bloody well don't think so!
Roger's voice is amazing.

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"Are there any paranoids in the audience tonight? Anybody that worries about things? Pathetic! This one's for you, its called Run Like Hell"
(Roger Waters, The Wall Live 1980)