Here are some of my faves:
Eagles - Hell Freezes Over. I can't believe that nobody mentioned this? I'm sure we all have it.
The Who - Live at Leeds. This is how a live concert should be.
Jackson Brown - Running On Empty. Sublime sounds, just excellent for listening to on that roadtrip.
Gram Parsons and the Fallen Angels - Live 1973. Perhaps not the best sonics but one of the very few live recording of Gram and Emmylou singing their world famous duets.
The Band - The Last Waltz. What can I say. Four CDs of one the world finest IMHO bands. I wanna get the DVD of this to go with my boxset.
Cowboy Junkies - The radio one sessions. A live set from the masters of cool laid back music. Sublime sounds from the Margo et al.
Trish Murphy - Captured. A little like Sheryl Crow but better looking, better songwriter, better guitar player and a better singer!
Alison Krauss & Union Station - Live. Wonderful uplifiting bluegrass sound from one the masters.
Steve Earle, Townes Van Zandt & Guy Clark. At the Bluebird Cafe. Three of the worlds best songwriters live featuring the late great Townes.
10,000 Maniacs - MTV unplugged. Fine introduction to the sounds of the Maniacs.
VH1 Storytellers - Johnny Cash & Willie Nelson. Just two guitars, two stools and Willie & Johnny.
VH1 Storytellers - Billy Idol. Wonderful live set with guest Stella Soleil
Natalie Merchant - Live in concert. The unimitable Nat Merchant doing what she does best. A memerising album of great wonder and beauty.
Queen - Live at Wembley 1986. Freddie owned the stage! There are few frontmen who can match upto Freddue Mercury IMHO. He is still sadly missed here.
Pink Floyd - Pulse. The Floyd put up an amazing show. I have this on Vinyl and it's most excellent.
Kris Kristoferson - Austin Sessions. Miss this one at your peril! All the songs that you know and love.
Brian May band - Live at Brixton Academy. Live standards from his years with Queen with some tracks from his solo carreer. A very distinctive sound from Brian May's guitar and the drumming of the late Cozy Powell.
Lynyrd Skynyrd - One More From The Road. The live southern rock sound of Ronnie Van Zandt captured for ever on CD. Does rock get much better than this?
Cowboy Junkies - Trinity Session. A hauntingly beautiful sound.
Michelle Shocked - The Texas campfire tapes. Debut album from Michelle. An amazing sound of just her, her guitar and a fieldfull of cicadas. It was recorded on a Sony WM6? Professional Walkman at an outdoor concert in Texas back in 1986 and still sound phenomenal.
I could probably think of a lot more given time but these are live albums that immediately spring to mind
Sound As Ever