The Greatest Progressive Rock Songs Ever...

List Rules
Best progressive rock songs...
Are you a progressive rock fan? Originating in the United Kingdom in the late 60's and with it's peak in the 70's and including such greats as ELP, Pink Floyd, Yes, King Crimson, Rush and so many more making some of the best music of the 70's. Let's start a list and please add some of the many missing greats...
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