Aqualung, by Jethro Tull (1971): Aside from the most famous opening riff in rock, this album has a lot going for it. It's not quite a concept album, although side 2 takes several broadside swipes at organized religion ("My God" in particular). Side 1 is a series of character sketches, most famously of the titular derelict, who may or may not bear some relation to Charleston's famous street denizen of the same name. The more muscular classic rock tracks are set off nicely by some more pastoral bits. A good listen, overall, if not quite a match for Thick as a Brick.