What are your favorite songs or albums for illustrating a deep soundstage?

Depth…

I remember using, for speaker positioning purposes, “Fade into You” by Mazzy Star, “The Golden Age” by Beck and “Someone Saved My Life Tonight” by Elton John for their big, deep sound, but my choice of these tracks I think came down just as much to how dirt simple the percussion is.  
The “centering” and “physical presence” of those snare drum hits (again, dirt simple, just the 2 and the 4 of each measure) was easy to locate and use as a very “visual” centering “fulcrum” of the whole activity.

@blisshifi Yeah, I found the ability to so easily “see” the snare drum with such a “visual” presence, consistent, steady but minimal (or the opposite of ‘busy’) on “deep sounding” tracks helpful. YMMV, and you might certainly have other tracks you’d prefer in a similar vein.  
That particular minimalism with the snare I found helpful to provide a “centering” base I could work outwardly from.

@blisshifi

Wow.
Not only are you loaded with the good stuff, but also sporting the uniformity of the silver/wood/black visual aesthetics, all the way down to the actual turntable…damn!! Way to go!!

The good stuff awaits…