What stereo equipment do respected musicians listen to?

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..

Most serious musicians don't make enough money for a hobby like audio and they have to spend bucks on their instruments and the like. I've done decades as a "working musician" (along with some other far more lucrative things which have funded my gear issues and retirement status) and it's amazing how utterly clueless some talented players are regarding audio, including pro sound, and hey...that's just fine...I'll take care of it no problemo...However, I have met a few in my live sound mixing world (my other music related gig) who are audio geeks and those are some serious pros. Rare, but as I've said before, they're about the same percentage as regular people. And that's a minority. 

I not long ago saw a vintage photo of Louis Armstrong in his home studio listening to what appeared to be a pair of Tandberg 64X tape decks, a Marantz 7C preamp and 10B tuner.  The power amp(s) were obscured, but it's a safe bet it/they were Marantz as well.

Having found a virtual tour of the Louis Armstrong house, I was able to get a better look at his equipment.  The preamp appears to be a Marantz 7T and the tuner is probably whatever was offered at the time as a mate to the preamp.  One of Tandbergs was a player only.  He died in 1971, so solid state equipment of any quality was only around for a few years.  He appeared to have a automatic changer to play LP's, what kind is a mystery to me.