Do you know your prog? A quiz to test your knowledge of prog trivia

Here are 20 photographs of prog album covers, zoomed in to pick out small details.
Simply identify the 20 albums.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

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Do you know your prog? A quiz to test your knowledge of prog trivia

Here are three albums:
ESP's debut CD Invisible Din;
GTR's only studio album GTR (shown here on vinyl and as a re-mastered and expanded CD; and
Crises by Mike Oldfield (on vinyl and CD.)

What is the link between them?

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