Phish offer downloads of all their recent concerts in mp3, redbook FLAC and 24/96 FLAC-HD- details at http://www.livephish.com/
Nugs.net their technical provider also do the honours for others bands such as the Black Crowes, Metallica- check them out if interested in live rock music.
http://www.dgmlive.com/ provide concert downloads for King Crimson and Robert Fripp in mp3 and redbook FLAC. One fine deal is all 14 shows from the 1995 tour for $60 in redbook FLAC.
Hope this helps in some small way.