I don't believe in the "specific system myth." I listen to a little bit of everything:
Lots of Classical
Lots of Jazz (pre-69),
A little less jazz post '69 fusion
Classic Rock and Roll
Some Opera
Lots of Standards (Sinatra, Streisand, Tony Bennett, Michael Buble')
The only thing that I don't listen to is Hip-Hop and Rap. I've tried, but being in my early 50's and raised on Miles Davis, Dave Brubeck, Oscar Peterson, Maynard Ferguson and Classical, I just don't "get it" when it comes to Hip-Hop and Rap
A good or great system can do all of those musical styles well.
A do understand why audio salesmen ask the question tho.
I always bring my own music and if I'm auditioning new audio equipment, I may put down good faith deposit and take it home to listen over a long weekend. I can usually tell, real quick, if a piece is going to work. For nuanced listening, I'll listen for a couple of days.
I also try to change only 1 piece at a time, if I can.
I'm currently considering what to do about my subwoofer issue.
Side Note! I could have kicked my audio sales guy that told me for years "You've got great speakers, you don't need a subwoofer". Yeah, right.
I may put a new cone and electronics in my old Velodyne enclosure or I may buy an new sub. I'm eyeing the Axiom EP500 sub.
HsvHeelFan