Great sounding/recorded albums

Check out the Reference Recording label. Great recordings in multiple genres and great for demonstrating any system.

Acoustic sounds recording Weepin Willie , Jamie Lee Robinson and more...yup Kind of blue is classic bought to 45 rpm ... Lyn Stanley’s do have excellent recording...

Any Stockfisch SACD or Blue Coast Records recordings.  Superlative!

Here's what I've been using for a long time: Weather Report's I Sing The Body Electric and Sweet Nighter. Columbia Records LPs. The songs respectively are: The Unknown Soldier and Boogie Woogie Waltz. Joe Zawinul, Wayne Shorter and crew show how to really do jazz-fusion!

Or "big" sounding symphonic albums that don't sound too thin with good bottom end.

Stuff that I can show off my system to friends and they go "wow".

If you are equipped to play CDs, try to find the recording of Dvorak's "New World" symphony (Symphony No. 9) on the Chesky label, identified as Chesky CD31, Jascha Horenstein conducting the Royal Philharmonic Orchestra.  It is out of print, but is probably findable in used condition on eBay and possibly at Amazon.

When your friends have raised their jaws back to the normal position after listening to it, they will fall again when you tell them that it was recorded in 1962!

Regards,
-- Al