I'm not going to say they are underrated for two reasons 1) They charted a number of times 2) Ratings are stupid. But they are slowly becoming one of my favorite (top 10) prog bands. I've been listening to "A Whiter Shade of Pale" since I got back from tour (Aug 2nd) since I bought it at a record shop in... I think it was Boston, it was in the "old fogey section" (sorta, it was a punk store). I also got Adrian Belew's Lone Elephant, which is also amazing, but Harum sticks out. Fans? I'd recommend checking them out if you haven't.