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Yeah, but most prog bands have a clearly defined sound (not that the bands usually sound the same but there are lots of sonic similarities between most prog bands), whereas an "experimental" band could be all over the place.
I don't think "progression" means there's ever going to be an end, maybe a better term would be "Furthering"... "FURTHER ROCK". They're just trying to advance the art of rock beyond verse-bride-chorus-verse-bridge-chorus-solo-chorus.
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