They're one of my favorite bands. For anyone who doesn't know who they are, Red is their best album, Court of the Crimson King is their most famous. If you like more experimental music, Larks' Tongue in Aspic is great.
Since I heard them mentioned on Venture Bros. (prog rock in general) I got into it a bit. I am totally into that style, but wouldn't know where to start as its too far out of my realm of knowledge [YOUTUBE]Af8ltlcZNi0[/YOUTUBE]
Prog is probably the most diverse genre of music, but you can start with these albums: King Crimson - Red, Court of the Crimson King Yes - Close to the Edge, Relayer, Tales from Topographic Oceans Rush - 2112, A Farewell to Kings, Hemispheres, Permanent Waves Pink Floyd - Animals, Wish You Were Here Jethro Tull - Aqualung, Thick as a Brick Genesis - Selling England by the Pound, The Lamb Lies Down on Broadway Van der Graaf Generator - Pawn Hearts That should keep you busy for a while :icon_bigg If you need more, Prog Archives is a great website.