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For gear comparison purposes there's actually something to be said for hearing many rooms play a track you are ridiculously familiar with so you can discern the sometimes subtle differences between rooms. I approach the listening rooms more diagnostically in order to compare gear than going to enjoy the music. I listen to my system at home or go out for a live show if my goal is to just enjoy great music.
Listen, there is elevator music, and there is Tin Pan Alley, by SRV. I disagree, as it is an excellent example of a great song, a great recording, and, by a great artist. It has been one of my references for years, and it easily, and quickly, helps me identify problems and virtues of any new system or component I am evaluating.
Unfortunately systems take time to settle and 3 days is no where near the amount of time needed for a setup to start really gelling. If these shows were able to give the designers 3 or 4 days before the show to get their sound going they would possibly (maybe) be able to play a wider range of music, or at lease have time to select more that sound passible for a showing, but a day of setup and then the show itself is never going to cut it.
Even though trade shows bring a lot of excitement for a couple of weeks to the hobby they're not a very good place to be making sound judgement. Maybe someday there will be audio expos instead of audio trade shows, or in addition to.