What is the VERY BEST CD album you've ever heard?

all-right.

Let's call the common stuff mainstream whether it's rock or pop or hop of any kind.

Mainstream usually can be found in thrift stores for less than a buck

Blood Sweat and Tears, Original Master Recording. 24 kt Gold Plated. 

I've had this for a while now, but finally cracked it open: Spheres II by Delerium.  Spacey, ambient, juicy, spooky, moody instrumentals.   Sounds exquisite. 

@tylermunns  

Terms "pop" and "rock and roll" have been in use by music industry professionals, since early- to mid-1950s.  I entered into what I thought was a discussion.  If this is your idea of a game, you can declare yourself the winner by forfeit.

I have a couple I never get tired of Jeff Beck Wired and Special Efx Confidential