I agree with those who say that one ought to bring samples of all of the musical genres that one listens to, with examples of each with which one is familiar. Of course, if one's musical taste changes over the years, then it will have been good if one also listened to those other types of music as well.
If you like a genre, or think you are interested in getting into it, but don't have any examples with which you are familiar, you will still want to listen to samples of that genre, and compare with different speakers in your price range.
It is also a good idea to listen to as many different types of speakers (e.g., ribbons, horns, domes, whatever) as possible, and to listen to as many different brands as you can find in your area. Back in the 1980's, my willingness to audition speakers I had never heard of before got me a nice little gem in the Heybrook HB2 speaker, which was my main set of speakers for over a decade, and I still have them. They are a very rare piece of gear, as my wife asked me not to ever sell them, which she almost never says about my audio gear. (Incidentally, Heybrook reused the model number on a completely different speaker years later, so in order to judge the speakers I have, you would need to make sure you are looking at ones from the 1980's.)
