This article is from the Progressive Music FAQ, by Phil Kime(Philip@kime.org.uk) with numerous contributions by others.
That depends on who you ask. There are many people who do consider
them progressive, and many who do not. There are albums by each of
these bands that may generally be considered progressive, but even
some die-hard fans of the aformentioned groups will admit that each
has put out non-progressive material as well.
 
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