What recordings do you use?

I have two recordings i use to test peoples stereo system for being able to unravel low level detail. One is for the analog front end. On the Second Winter LP the very first song "Memory Pain" just a split second before the guitar opens up the song you can hear a cough. A turntable which is a set up properly should present this. What's also great about this album to is it is a three sided album and since side four is blank you can use it for adjusting youe anti skating.
For testing the digital realm I use a song off of Stan Ridgway's Holiday in Dirt "Beloved Movie Star"(the cb demille mix). As it states in the liner notes on the third verse if you listen very carefully you can hear Stan's dog Bart barking away. If your system reproduces these then you have a very revealing system
What songs do you use for system testing?