Today I will only point you towards a great site, that is
Here you can find tons of stuff, from a huge live archive:
to experimental/classical music:
and public domain and open surce movies as well (from Buster Keaton to Roger Corman):
I have just downloaded today two great gigs from it, one is a ROBYN HITCHCOCK one, from a radio broadcast of the last year, whose sound is simply perfect (http://www.archive.org/audio/etree-details-db.php?id=30670), and a 1987 DREAM SYNDICATE one, which obviously does not sound that well, but it is always a good feeling to listen to some live stuff ex Wynn's band (http://www.archive.org/audio/etree-details-db.php?id=24604&from=browsePopular).