Originally Posted by Trollheart

Oh no, they're huge. I regularly get slagged off for not having been into them from an embryo; I get told I can't be a proper prog fan without having at least heard King Crimson, which I never had until about a year or two ago. They're definitely on the level of Genesis and Yes and all the great greats.

Originally Posted by Guybrush

Yes, there are TONS of obscure prog bands, but King Crimson is not one of them. I heard about them long before I ever had any real understanding of what prog rock was.

Edit:

At a glance, I didn't see any obscure prog bands on your list. ELP, Genesis, Jethro Tull, Yes, all huge. Gentle Giant is relatively obscure outside of progheads, but relatively huge to people who dabble in the genre as their first 7-8 albums are generally well liked.

Soft Machine are more obscure again, but are much better described as jazz rock rather than prog.