Two of my other favorites that I neglected to mention, especially for live ambience and presence testing, are:
-- Eric Clapton, "Unplugged"
This one really sets the bar pretty high for me in terms of a live recording. The engineering quality, the sound quality, the performance itself, they all come together so damned well it's simply a keeper for me. Clapton's fingering on the fretboard can be made out quite clearly at times, his foot lightly tapping on the stage is easy to pick out with quality headphones.
Just that foot tap really caught me off-guard the first time when it just jumped out of the mix. That bass means something to me in terms of presence because of how it stands out and I expect to hear it in a certain way so that's how I judge the playback equipment. Of course the recording itself is so well done what with it being acoustic. Clapton's guitar work never sounded better as far as I'm concerned.
Kudos to the production outfit that did the recording because it stands out in a world of mostly crap, I'd say.
-- Alice In Chains, "Unplugged"
Seriously, see the above. Again, the engineering, the sound quality, and the recording itself are simply amazing and have to be heard to be believed. It's as close to the actual feeling of a live performance as I've ever been able to locate on a recording.
There are a lot of other Unplugged albums that I like also: 10,000 Maniacs, Pearl Jam (this one kicks hard), and of course, Nirvana.
It's been cool so far seeing the other choices by everyone. That was the idea behind this thread, to locate some different stuff that I might not even be aware of that just might sound fantastic as demo/test material.
Thanks for your contributions, and keep 'em coming.
bb