What stereo equipment do respected musicians listen to?

Here is a start.

ATC speakers !!

Beck, Kate Bush, David Gilmour, Mark Knopfler, Diana Krall, Ray LaMontagne, Tom Petty, Sting, Roger Waters, and Jack White. These world-famous artists are just a handful of the household-name musicians that listen with ATC. Perhaps they’re taking a page from many of the most in-demand engineers and producers that depend on ATC to create timeless works of art. Industry professionals such as Michael Bishop, T Bone Burnett, James Guthrie, Bob Ludwig, Gavin Lurssen, Max Martin, George Massenburg, Alan Moulder, Shawn Murphy, and Fred Vogler all rely on ATC to hear every last detail.

There was a pic of John Lee Hooker in the early 90’s from an interview with Rolling Stones or some popular mag. He was in his living room and the stereo system behind him was a JC Penny branded rack system, that was so prevalent in the 90’s. Cheap, mass manufactured junk… the kind that Audiogon patrons wouldn’t touch with a 10 foot pole! 
Musicians are not always audiophiles and vice versa :)

Most musicians listen to the actual music  content and are not concerned with audiophoolery. 

Most musicians listen to the actual music  content and are not concerned with audiophoolery. 

Agree completely — most musicians have mediocre to poor systems.