Favorite song to demo or test drive speakers?

The whole Emmylou Harris album "Cowgirl's Prayer" with it's goods and bads.

As a sidenote important to test the capability of a system on modern R'n'B and electronic. Very demanding from 15-20 000 Hz. Kills Harbeht's :-)

Lynyrd Skynyrd - S/T
Rickie Lee Jones - S/T

Dire Straits? Been to too many audio shows? :-)

Fink recordings is a very good choise. All you need is there.