Best First Progressive Rock Albums From Bands

The list item does not have to be the first album by the band. It has to be the first progressive album from the band. For example, Meddle was the first album when Pink Floyd switched to progressive rock.
The Top Ten
1 In the Court of the Crimson King - King Crimson
2 From Genesis To Revelation - Genesis
3 Instrumental II: Your Brain on Our Music - Dream Theater
4 Yes - Yes
5 Undertow - Tool
6 Acquiring the Taste - Gentle Giant
7 Ummagumma - Pink Floyd
8 Contradictions Collapse - Meshuggah
9 The Second Stage Turbine Blade - Coheed and Cambria
10 Remission - Mastodon
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