Which albums by well known artists do you feel have been overlooked?

Here are a few I want to mention to kick things off:

AC/DC: Powerage, Flick of the Switch - These albums never seem to get any attention, yet I think they are two of their best releases. Guns For Hire from FOTS is just rocking, and every track on Powerage gets me tapping my foot.

The Rolling Stones: Their Satanic Majesties Request - Far and away my favorite Stones album. I think of it as their "Sgt. Pepper".