RED

This is one of the main albums that turned me on to prog, everything about it seemed to fly in the face of the music id previously heard (odd time signatures, diminished 5th's, classical structuring). Not only this but the album is also home to the best King Crimson track ever in Starless. Almost in a sonata form, and with an extremeley intricate middle section that resolves back into the original melody, this song is one of the best peices of music i have ever heard.