This begs the question: How many albums really have a cohesive musical or lyrical theme these days?

As a side to this thread... I just picked up the new The Mars Volta album (Omar and Cedric of At the Drive-In's new group). The entire album is Cedric's interpretation of what he thinks his friend is experiencing while in a coma after a failed suicide. Pretty cohesive, and highly recommended, especially if you were an At the Drive-In fan.