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

@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.

Song:  Nasty

Artist:  Vincent Ingala 

Chesky Jazz for Audiophiles

Volume 3

Track 47

Cream reunion concert at the O2 in 2005 I think. 
 

Stormy Monday

bliss,

You write that "Classical examples are also very welcomed." Here’s my favorite (of rather many; I listen to mostly "classical"): Beethoven’s complete incidental music to "The Creatures of Prometheus," performed by the Orpheus Chamber Orchestra (DGG 447 911-2). The overture is well known, but the complete music is not. Great "middle period" Beethoven, though.

Track 7 is especially compelling. It begins with a harp on the left in the rear, which is joined by a flute—also on the left, but in front of the harp; then an oboe on the right, which is answered by a clarinet just to the left of the oboe (so, about in the middle of the orchestra). Then, a solo cello comes in on the far right, to the oboe’s left but in front of it. The stability and precise location of all these solo instruments is maintained throughout this movement, even when the orchestra is playing tutti. The realism is really something, as instrumental timbres are very accurately represented as well. And the recording (all digital) dates from 1987! Not SACD, not 20-bit. Shows how important the abilities of the recording engineers is.