I won't mention
all the moments, but there are some:
KING CRIMSON -- 'Starless' from "Red" -- ta ta ta taaaa, ta ta ta ta ta taaaa, ta ta ta taaa ta ta taa
PINK FLOYD -- 'Dogs' from "Animals" (the guitar barrage closer to the end with lots sub-orchestration in the background)
PINK FLOYD -- 'Atom Heart Mother Suite' from "Atom Heart Mother" (the
moment when the choir explodes into the orchestrated section, followed
by drums)
ÄNGLAGÅRD --
'Höstsejd' from "Epilog" -- there are two almost identical moments in the song that send me a-shivering
well, you know what I am talking about
GENESIS -- 'Los Endos' from "Seconds Out" (the ultimate culmination of the best live album in the world)
And of course, the obvious 'Firth of Fifth' and 'Shine on You Crazy Diamond' 
Edited by Arteum