Best Album Purchase, or Best Evaluating Record


I would just like to know what you consider your best album purchase ever, or your choice of album used to evaluate a stereo system.

My best purchase has to be about 300 - 400 classical records, for $300, that contained many mint shaded dogs, Living Presence, and blue Backs (among others).
licoricepizza
The best ablum you could use in evaluating a system is the one that best represents what you like to listen to. If it sounds good that would be an indicator that you're on the right track.
Miles Blue. I own this music in five different media types, played on ss and tube rigs. The vinyl is still the best and when I go to dealers to check out new speakers, I use that as a reference. I take both the vinyl and sacd. A blu-ray will be available shortly. Wow.
I bought Rickie Lee Jones' debut album when it first hit the racks in Tower Records on the Sunset Strip in 1979. I think I paid $4.99 for it. Great recording, fine stamping, and still one of my reference LPs after all these years.
I like the Rickie Lee Jones too. Any Miles Davis sounds great as well. I just spun a copy of Relaxin' that was excellent. I haven't heard Workin' yet, but I will soon.
jazz at the pawnshop. if a component can't play this,especially the last track on side 1 without everyone in earshot dancing, it's no good.