I have helped an exhibitor at the Capital Audiofest.
The best classical track (it sounds great on any system) that I've found is Vivaldi-Concerti for Hautebois, Cordes e Basse-Bernardini (conductor) on Astree-track 4.
For Jazz, I like Anour Brahem-Thimar-track 1. Stefano Battaglia-Re Pasolini-track 1 or 2.
For pop, Handsome Family-Far From any Road (track name)
For LPs, Jazz: Yamamoto Trio-Midnight Sugar (track 1); Bill Berry All Stars-For Duke (M&K direct to disc recording); Great Jazz Trio-Direct from LA-Night in Tunisia (terrific drum solo).