I agree with floyd the barber that the screams in the Ummagumma version are the most piercing and spine-tingling. Still, of course almost everybody will preffer pompeii and Ummagumma, but what do you guys think of the other versions? and does anybody have a clue about 'beset by creatures of the deep'???

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who are you and who am I
to say we know the reasons why
some are born and some men die
beneath some infinite sky...
so all things time will mend
so this song will end

Gilmour in 'Childhood's End'