Define 'well-known'...
But, I think this is awesome, Frost*
My favorite guitarsolo is from the Neal Morse Band
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I also like Ray Wilson
One other band crossed my mind that i want to mention: Threshold has really good songs, and i listened the album Legends of the Shires dozens of times....
GET OUT OF MY HEAD!Flash - the first two Peter Banks albums are really great. It's interesting that the band kind of disappeared from the collective prog consciousness.