Aardvark is kind of ELP-like in that it's keyboard-driven. Not much to say about them... Good, but run-of-the-mill.
Atomic Rooster is closer to a straightforward rock band, with fairly minimal prog influences (at least in what I've heard) In Hearing Of and Made In England are both pretty good, but ultimately non-essential. I don't really know about the rest other than the fact the Carl Palmer played on the debut album before joining ELP (as if anyone didn't already know that
)
Blue Oyster Cult is a great rock band that were allegedly only "prog" during their early years. but that doesn't devalue the rest of their career! Everybody has probably heard their HUGE hit "Don't Fear The Reaper", as well as some others such as "Burning For You" (it's
not a love song!) and concert favorite "Godzilla". I'm not familiar with their early work, but as a document of their worth I'd recommend
Extraterrestrial Live to someone looking for a place to start (in the band's "rock" side), which I also find preferable to their earlier big live album
Some Enchanted Evening.
Camel is good for some mellow but skilled playing. Typical sound of 70s Symphonic, I suppose, but they do it well. The first 4 albums (particularly
Moonmadness) and
Live Record are the ones to get. And as good as
The Snow Goose is, the whole thing is played on
Live Record.
Catapilla is a really great band with a female vocalist and interesting instrumentation. Although categorized as Eclectic Prog, I have always considered them to be truly split between that genre and Jazz Rock/Fusion - lots of brass, etc. Very enjoyable listen if you are into it. PA ratings show
Changes as our member's preferred album, but personally I find the debut,
Catapilla to be superior (not to mention longer)
BTW: Rushfan, thanks for not including DragonForce