IMO the two best tracks to demo or test any system

Celine Dion - Its All Coming Back To Me
Led Zeppelin - In My Time of Dying

Both songs can give you a great understanding of any system your listening to, or building or wanting to build.

May examples are from Celine Dion's greatest hits on CD, I would like to use the original album, I find Greatest Hits can be compressed more to fit more songs on the CD as apposed to the original release. Led Zeppelin Physical Graffiti Classic Records pressing.

Just my thoughts I wanted to share with my fellow nut cases :)

Peace Kev
Ricki Lee Jones under the boardwalk cover. It's dynamics and bass is enough to send a mere mortal back to best buy with his receipt in his pocket and Bose speakers under his arm.
Eddie Vedder 'Long Nights' off the Into the Wild sound track.

Fiona Apple 'Shadow Boxer' off of her Tidal release.
Amused to death by Roger walters, and some modern stuff from Lindsey Stirling.