I do have a folder named Test.
What I do first is a "tour the force", a little bit of "brutal display of power"
My speakers are small, 6 litre of volume. What strikes people first is how big they can sound. This is why I start with some of the tunes I recommended in the Subwoofer Candy thread - Massive Attack; Pray for Rain, SZA; Ur, Nx Worries; Lyk Dis and so on.
Whoever never heard of these speakers is usually looking around the room to see where is the woofer.
After this, we're going into details and subtlety. Crossroads by Tracy Chapaman is my go to for that "the singer is in your living room" effect. And it works every time. Especially if you play that after some Dire Straits. If I want it loud, clear and "natural sounding" I crank up some Chris Rea; Daytona, Paul Simon; Boy in the Bubble, Steely Dan; Black Cow... People are astonished how clear it is even when being loud, how you can still talk to each other and how it's not tiring.
Strings are so soft, romantic and beautifully recorded on David Gray; Last Summer and KEF's do wonder with these, everyone gets the goose bumps. They sound heavenly.
Depending who is visiting me, I might go into more specifics like explaining how there should be nothing but dead silence when there's pause in the song because this means that drivers are on a tight harness

I play Sade; Soldier of Love and Harold Faltermeyer; Axel F (it's a crapy song, but conveys what is important).
I play some Loreena McKennitt for spaciousness as she often has her music played in some churches.
At the end I usually ask people I'm demoing my speakers to to tell me what they like so they can hear it through the KEF's. Other than having my room ad some boominess, I never found anyone who would dislike them in any way.
I did find some people suspecting of something being fishy since they are so small and play quite big. They often think something is bloated, but when they listen to how it sounds, doubts are usually dispersed. They don't find anything out of proportion in the sound itself.
@Bucknekked you most certainly do know Carmina Burana, you just need to hear it. Maybe you don't know it by name. When we were younger we were all struck by the
Boorman's scene of the knights of the round table galloping to the most famous part of this composition. It cuts into your brain and stays there.