Great first albums in prog rock

It is often said that it takes a band several albums to really hit their stride and create a great work of art. For many bands, their "classic" release is their third or fourth album...possibly their second...but not usually their first. And that makes sense to a great extent...it is definitely pretty unusual to have your sound and style together on the first try. But I can think of a lot of progressive rock bands that came right out of the gate with a brilliant first release:

• King Crimson - In the Court of the Crimson King ... Not my absolute favorite of theirs, but obviously very, very strong.
• Premiata Forneria Marconi - Storia di un Minuto ... This is in fact my favorite PFM album, with Per un Amico a close second.
  
• Emerson, Lake and Palmer (self-titled) ... I probably prefer Tarkus or Pictures at an Exhibition to this, but still, what a debut!
  
• Triumvirat - Mediterranean Tales (Across the Waters) ... Though this goes against 'conventional wisdom,' I much prefer this one to their later albums, even Illusions on a Double Dimple.
• Area - Arbeit Macht Frei ... Once again, this is my personal favorite even though a lot of folks prefer Caution: Radiation Area or Crac!
• Supertramp (self-titled) ... Seriously, if you haven't heard this, PLEASE check it out...it is an incredibly beautiful record, and in my opinion much stronger that anything else they released. This is one of my favorite records of all time. And it is more "prog" than any of their other releases, whatever that means... ;-)
• Yes (self-titled) ... Well, of course! I love everything they ever did. Some people think the first couple of albums are weak, but I think they are both gems.