Usually clean, cussing/thematic elements are both rare.
Completely clean albums (no cussing etc.) include
Images and Words,
Scenes from a Memory,
Octavarium,
Black Clouds and Silver Linings
Systematic Chaos (The Dark Eternal Night and In the Presence of Enemies Pts 1 and 2 each have religious references to hell)
Mostly clean albums include
Falling Into Infinity (Burning My Soul has one cuss in the 3rd verse)
Awake (The Mirror has 2 cusses, Erotomania is instrumental, but I wouldn't go throwing the name around unless everyone knows that)
Six Degrees of Inner Turbulence (War Inside My Head, The Test That Stumped Them All, and Goodnight Kiss each have 1 cuss)
