Favorite song to demo or test drive speakers?


What is the first song you played when you listened to your new system for the 1st time? 
mhewitt
Important to have several ~~Reference recordings~~~ when determining if a  new piece of equipment is great,,avg or poor,,,and also for revealing mods,, if a  success or a failure,,,Knowing how a  reference cd sounds pre mod post mod, , tube rolling.
Faith Hill, is one such reference,,,opening track You were Right There, ,,, how much passion comes through, Diana Krall. 
Others include,  Sophie Milman, , Gatemouth Brown  Diana Krall 
Yaz - "Situation" from the Upstairs at Eric’s album.
Norah Jones - "Lonestar" (female voice demo) and Painter Song from her Come Away with Me LP.
EP version of Steve Winwood's Higher Love.