There is a thread about this on another popular forum, but I don't think there is one on this forum.
I have an un-dying love for the Rolling Stones' 1983 album "Undercover."
In my opinion, it is their lost classic. It doesn't sound like any other Rolling Stones album, but that is what makes it great to me. It is full of darkness, murder, and blood; and it is also full of the '80s. There is much experimentation by the Stones with electronic drums and such. For anyone who might be interested in this record, the Japanese SHM-SACD sounds incredible and is the only way to listen to it nowadays. It sounds absolutely fantastic!
Of course I am biased, because I was listening to this record everyday when it came out. I used to own an Alfa Romeo GTV6 in the early '80s, and this is one of the records I listened to while driving around in my Alfa and burning early 80's unsuspecting 5.0 Mustangs. Those Ford drivers never knew what hit them with a V6 Alfa in Dallas, Texas in '83, LOL! I think this record has stood the test of time. It is a very unique record in the Stones' catalog.
It's like a time capsule. It has elements of the '80s like electronic drums, but the gee-tars of Keith and Ronnie still rock heavily over all of it.
Personally, I think it is the greatest "lost album" in the Stones catalog. No, it isn't the greatest Stones album, but it's my favorite "lost" one. Some people hate it, but I think it's completely underrated, and the SHM-SACD just flat rocks!