Best tracks to "show off" your system

I know there are certain songs that seem to bring out your system better than others.

which songs to you put on to show off your system to friends?

for me:
1. My love is - Diana Krall
2. Girl from Impanema - Getz/Gilberto
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"Waves:The Bossa Nova Sessions". I started my vinyl collection in 1958 and this double album (one disc is 45RPM) may be the best sounding non-classical record in my stable.
Lkc boot - What Sheffield Lab site? says "This domain is expired". Is there another one?
FIM Audiophile Reference IV offers a nice mix of well recorded, musically enjoyable titles.
Wstritt, I believe Sheffield is relocating and perhaps that why their page is down. (last CD on the list) indicates that one should still be able to order it. I guess I'll have to wait and see.

Since I am here...another favorite demo CD is Lorena McKennit (sp) Book of Secrets. I use the third song, but they are all exceptional.