My "testing" playlist is really just tracks that I enjoy and know well in my system. So, if I stop by a hif-fi store I'll bring a thumb drive with a few such tracks. After I break in a new wire, say, I'll play these and listen for certain things (e.g., bass on bridge on first cut below). These are not necessarily very well recorded. A few of these are:
"Out All Night", The Pietasters
"King of the Mountain", Midnight Oil
"Last Laugh", Dancehall Crashers
"Swamp Thang", Hipster Daddy-O and the Hand Grenades
"And She Was", Talking Heads
"Out All Night", The Pietasters
"King of the Mountain", Midnight Oil
"Last Laugh", Dancehall Crashers
"Swamp Thang", Hipster Daddy-O and the Hand Grenades
"And She Was", Talking Heads