Isn't this thread about evaluating speakers? I assume that means at the showroom since you can listen to all of your own music at home.
I bring my favorite music that doesn't play well on my current speakers in order to evaluate a potential purchase. For example if something sounds sibilant at home, I'll bring that CD to the showroom to see if the speakers I'm interested in are better at handling that recording.
I don't understand the comment about streaming music rarely sounding good. That would be the case if you are on Spotify rather than any of the lossless services. That is just a matter of getting a better service and with it higher quality source material.
Very odd how there are some posters here that get all up in arms about their perception that certain threads are manipulative. Fine. Don't respond. Done.