What stereo equipment do respected musicians listen to?

I don't know about musicians but the studious I have been in are filled with Bryston  components.

Joanna Newsom. She stated in one of her rare interviews that she has a "tube-based system with decent speakers",(didn’t advertise any brand names), and finds it funny that her actor husband, (Andy whatever), likes to walk around the house with his ear buds blasting. I read this interview around the time of her release of "Divers." Can’t find the link right now. BTW, ALL of Joanna’s albums have been recorded in old school analog. Go get them.

I set up decent systems for the the Airmen of Note bari player Don New and for a  reed player friend who played all of the major hotel/casinos in the 60s.  They both had dismal setups.  That’s my foray into that world.  I’m sure it varies.

All the musicians I know and have known are/were indifferent to audiophile notions of "high fidelity." They inhabit the world of actual music, not our world of sound reproduction. A different realm. Audiophiles encourage one another to "enjoy the music!," but that's delusional. All we have are records and tapes and discs and and digital simulacra from storage media involving dozens of transductions and no musical instrument in sight. A bottomless hobby, but not music. I know because they told me so.

generally, whatever is at hand, they tend to have an ability to hear through the shortcomings of very ordinary systems explain nuances in performances that most people would fail to detect

makes you wonder sometimes..