What selections do you play when showing off your system to others?

@immatthewj Yes, the Live In Paris Version.

Also, Check out Black Hole Sun by Norah Jones live...

When pressed it can be difficult for some people to come up with a song on the spot.  Especially when surrounded by hundreds of CDs and records.  But if someone has made it into my listening room, then the odds are good I know at least a little something about their musical tastes.  So I like to pick something they are likely to have heard many, many times before.  Beatles or Stones.  Ella and Louie.  Take Five by Dave Brubeck.  You get the idea.  
It serves to put them at ease with something familiar and improves the chance they will hear something in that recording that they have not heard before.  

I usually get comments about the clarity of the vocals or the instrumentation, but occasionally someone says something really nice to hear like “I can’t really tell where the sound is coming from” or my favorite ever comment, “your subwoofer is really dialed in well.” 
I wasn’t using a subwoofer.  

Carla Bley - any of her LPs with full jazz orchestra.

I played UB40: Red Wine to sell my Salk Songtowers. It was sold as soon as the bass line came in. No negotiating. Had to prove there was no subwoofer. It's really the room.

Also outstanding: 

Lalo Schifrin: Bullit Soundtrack 1968.

John Barry: 007 theme

Ella Fitzgerald: The Very Thought of You.

@immatthewj Yes, the Live In Paris Version.

Also, Check out Black Hole Sun by Norah Jones live...

@andynotadam  I was on an ebay SHM CD buying binge, and I believe I did get that live Norah Jones CD.  I have only listened to it once, though.  I picked up the Live Krall SACD from Amazon when I was on another binge.  I do really like that live cover version she does.  Although I think I've only listened to that one 3 times, my impression was that it was very dynamic.  Wallflower is my favorite SACD by Diana Krall; I like the tracks she covered and I think she did a great job.  Her cover of "Desperado" rivals Linda Ronstadt's (imo) and I love her cover of "California Dreaming."

On yet another binge (MD this time) I think I picked up every SACD by Norah Jones they had available.  On one of them, she does a cover of Tom Waits "Long Way Home" that always makes me smile and want to sing along (which I don't, because I really want to hear Norah, not my own out of tune singing).