One more thing. There is a pernicious tendency for some people to regard progressive music as the jewel in the crown of the music. This is simply nonsense from people with narrow musical experience. Many experienced progressive music enthusiasts have very wise tastes indeed and you will catch a glimpse of these from time to time. I have done so and they have lead to very fruitful and rewarding music explorations in many different directions.
Progressive music is a small corner of music as a whole.
I encourage everyone to explore as widely as possible. Having said this, I and presumably you as you are reading this, suspect progressive music is a particularly interesting corner to explore. Discussion on r.m.p usually focuses on the lesser known progressive bands. While almost everyone reading r.m.p is an enthusiast of one or more of these groups, many are not terribly interested in what kind of beer Mike Rutherford drinks, Steve Howe's favorite vegetable, or the number of hairs on Robert Fripp's head. The purpose of this newsgroup is to explore a wide variety of progressive music, rather than trying to learn the most trivial facts about a few examples.