Best Test CD

I'm not talking about Music CD's per se but if one fits the bill that can test a systems performance then include it. I'm more interested in the test CD's from Chesky, Stereophile, Sound & Vision, etc. that help a person evaluate their own system and also to compare systems in the shop. Also, if it helps to calibrate speakers it would be a great plus. I haven't found one cd that has a great selection of music and good calibration tests.

My vote is for Chesky's test cd #2 for music and tutorials. Great disc to learn audiophile terms and how they relate to actual recorded music(transparency, holographic imaging, soundstage, are just a few topics covered). Great selection of tracks (Sara K, Ana Caram, Rebecca Pidgeon, Chuck Magione, piano tracks, drum solos, some great stuff). For pure calibration of system including video and surround systems, nothing beats the AVIA dvd and a ratshack SPL meter.