All those Buckethead fans step up (Alan,etc!).
If you guys don't know
archive.org, you're going to love it.
http://www.archive.org/browse.php?collection=etree&field=%2Fmetadata%2Fcreator
Its basically an open source depository, but it has an amazing live concert category that literally has hundreds of full concerts for download. No charge. Most importantly, its legal, as every artists link includes the text of the the artists' permission for fans to post what used to be called bootlegs. Most of the 100s of artists are unknown, but there are a couple of major names. Many of the concerts were also recorded straight off the desk, so the quality's great.
I'm a major Ryan Adams fan, and found a concert - brilliantly recorded - that he performed on
20 March 2009. A week ago!
Here's some of the others I spotted:
Grateful Dead (6 526, yes that's not a typo) concerts:
http://www.archive.org/details/GratefulDead
Buckethead (49 concerts):
http://www.archive.org/details/Buckethead
Warren Zevon - my all time favourite artist- (76 concerts):
http://www.archive.org/details/WarrenZevon
Ryan Adams (395 concerts):
http://www.archive.org/details/RyanAdams
Browse through the rest, and enjoy ...
[NOTE: Upon editing, I found the following earlier reference to this site in GFSA, but it explored a different angle of the repository:]
http://www.guitarforum.co.za/guitar-sites/free-public-domain-audio-including-some-real-vintage-stuff/