Matt - thanks for the wikipedia link, another interesting listing.
I liked a lot of 'melodic' prog rock (not too weird) and have records or cd.s from several/many bands on the list but of course, probably the majority I don't know of.
I would count as prog rock the likes of Genesis, Rennaissance, Camel, Pink Floyd, Yes, MMEB, Jethro Tull to name but a few and others on the list due to the degree of orchestration, diverse influences like jazz, folk and classical into rock and frequently in the seventies the use of electronic keyboards, but some of the others?
If you think back to the explosion of youthful diversity in the sixties and seventies .... Bands like Genesis, Focus, Pink Floyd to name but three were astonishingly different.
The 'why are you on the list' bands. I have several Queen cd's but never thought of them as prog rock, they are surely unique classic rock, nobody sounded like them. Did just Bohemian Rapsody do it?
I have a large Wishbone Ash collection, but again would not necessarily class them as prog rock, just really innovative song writers and really good rockers.
Is it, 'if you look at this wide list we might be able to flog you some other band?'