Is soundstage DEPTH a myth?

The answers from you guys are, yes soundstage depth is real. The only question left is would people experience it regularly or with just a few rare pieces of music?

Because of what I listen to, I recognize imaging, soundstage and depth most always.  But I'm sure I tend to favor recordings with those attributes.  However, most of the tracks in my 100K plus library have those attributes. 

Imaging, soundstage and depth are a result of the recording engineering and of course, the type of recording it is.  Listen to some well-recorded jazz or live jazz -- and that is most of it -- you can hear the room, the audience and there is depth and a sense of the room.  The same can be said for symphonic recordings and many studio recordings.  Soundstage and depth provide a sense of being in bar, the recording studio, or the symphonic hall.  Without the you-are-there attribute, my Alexa speakers would be sufficient verses my Klipsch, Martin Logan and SoundLab speaker rooms.

Don't listen to @audioman58 . 

You don't have to to spend that kind of money to get soundstage and depth. 

I wonder if rear fireing speakers ( often a midrange driver ) could help,
perceiving depth ?

I have Audiovector R6 Arrelé  and I do perceive depth .

As I mentioned in a earlier comment in general the more $$ you can spend per component the closer you can get to your audio nirvana .your records yes willhave a bearing on the depth also but if you have  agood balance in quality including 

quality-digital cables then you will get a fair amount of audio realism on a daily basis . Just expect to spend a minimum of a bare minimum of $20k to start 

for a respectable sounding system , and upgrade pieces as you can afford .being aAudiophile can add up $$ very fast.

Others have mentioned the ultimate demonstration disk by David Chesky and it is good, but his newest album, The Hifi Collection is superb! If you ever listen to Steve Gutenberg The Audiophiliac, he’s good friends with David Chesky and there’s a link to get the download for free. Anyway, the first song was amazing! I heard stuff from behind the he speakers and way wider than my speakers. 
 

https://youtu.be/dMSiWPBNW1w