Here is a little secret treasure from me. The site archive.org is as the name saying a achive for all kind of uploads. Must interesting is the live music achive.
Here you can find a lot of my fav bands.
Smashing Pumpkins (+1-100 shows), Gutterball (94)..........and
Black Mountain (Yes it,s fav of mine too. 38 Shows)
excellent sound quality. For fans of Grateful Dead, you can go banans in +11.000 shows