IMO the two best tracks to demo or test any system

Hah I thought the same way uptill I weighed each one to exactly 180g.

Who's Roger Walters?

Greatest hits usually get most of reprocessing of the original materials to match sound characteristics of one to another and therefore not on my list to demo.
Had LZ classsic records 180g pressing, but was not impressed compared to first press. It's definitely more quiet, but dynamics are sacrificed and makes me bored or is it just Led Zeppelin that I'm tired of listening to on all formats.

Small releases from the small record companies sound best to me:
CMP label: Charlie Mariano,Philip Catherine,Jan Garbarek,Bo Stief -- "October" on vinyl
Sky label: Irmin Schmidt -- Impossible Holidays on vinyl
WEA label german pressing of Carla bley's "European tour 1977"
almost ECM vinyls (especially german presses) are all great to demo.

I too avoid listening to that whining. Very depressive at any recording or mastering quality.
She's probably been screwed up by too many boyfriends and ended up with none. No wonder her personal life is kinda hidden in lines of wikipedia.