What stereo equipment do respected musicians listen to?

Here's a good article on Ron Carter's setup:

Frank Sintra next to a Clairtone Project G from the 1965 movie, "Marriage on the Rocks". It was after filming this movie that Sintra, so taken with the Project G, ordered 7 of them for himself and as gifts to his inner circle of friends.

I can understand how some musicians have simple set ups.

If I could play guitar like Jimmy Page, or keyboards like Rick Wakefield, violin like jean Luc Ponti, etc. etc., I would then listen to myself live, and be entertained, rather than invest   thousands of dollars into top notch equipment like I now have. Would probably have a simple setup. It's the love of live music and performance that drives me. 

I have a friend of mine that was with a moderately well known band.  He literally doesn't care what he listens on, he tells me his head fills in the missing details, as he already knows what the instruments sound like.