Whats your favourite track to play to the non hi-fi visitor?

"Right Time of the Night" by Jennifer Warnes.  I second The Carpenters, Steely Dan's "Aja" or "Babylon Sisters".  It really depends what your guest is familiar with - you need to engage them with music they like - non-audiophiles are not necessarily impressed with pure performance of unknown songs.  A good system will render a familiar song in a way that they haven't heard before.  And for God's sake, don't play it at concert volume unless they're hard rockers!

So many good ones mentioned already. Tin Pan Alley, Birds, Babylon Sisters. All sound great on almost any system. I have many to add to the list. Check any of these out.

James Blake, James Blake – moody British dubstep with a meticulously architected soundstage. He sounds very much in the room, with some scintillating electronica sounds that I can only describe as remnant digital circuit artifacts. Limit to Your Love will tell you how low your woofers can go. If your sub doesn't go to 20hz you're missing out. 

Beck, Sea Change – Incredibly realistic and transparent, immaculately recorded. 

Frank Ocean, Channel Orange – Crisp, electronic R&B, in particular Super Rich Kids, another test of your woofers. 

Ray Lamontagne, God Willin' & the Creek Don't Rise – Close mic'd Americana, lap steel guitar, prairie nostalgia. Best served with whiskey. 

Muddy Waters, Folk Singer – Up close and personal with Waters and Buddy Guy, who the record didn't want for the date because they thought he could only play electric, and they were looking for a Dylan sound. Waters showed up with Buddy Guy anyway and recorded a masterpiece that sounds like you could throw your arm around them. 

Radiohead, Kid A – Futuristic android electronica, urgent and ethereal.

Billie Eilish, When We All Fall Asleep, Where Do We Go? – A workout for your mid-bass. Big center image, crisp SFX, dark backgrounds, audio indulgence. 

Soloman Burkes That's How I Got To Memphis from Nashville or If you are looking for a video he does a great version of Cry To Me on Jules Hollands Later.Phil Manzanera's, Miss Shapiro on Diamond head, or even East of Echo or Frontera. Has anyone mentioned Blue Monday obviously overexposed but still great heart starting sound

Three little words on trio jeepy by Bransford marsalis.... Starts and then there is a pause as they discuss trying something out... Then 24sec in a parp which makes every listener jump and then completely engage... Have on vinyl but pretty tired so tidal hifi mostly..... 

@diamondupree pretty much mentioned others
James Blake (superb) - wilhelm scream
Bill callahan - rococo zephyr (the voice close mic)
Pink Floyd  - money

Depending on guest taste I ask them for Fav track... They then comment afterwards they heard things they'd never heard before (after sometimes 1000s of plays)