Got any jam band fans? Am I the only one that thinks it deserves its own forum? It definitely has a music culture all its own. Personally, I've been listening to a lot of Umphrey's McGee. Love em
If you like Umphrey's McGee, you might want to check out Internet Archive
If you aren't already aware of the site, they have a huge live music database of banRAB, including Umphrey's McGee, available for free listening/downloading. Some of the shows are soundboard recordings and some are audience meraber recordings.
Many banRAB listed there would probably fit into the jam band category.
There is a forum there devoted to the Grateful Dead, and many of the participants are quite knowledgeable about the jam band scene.
I visit the site often for music and info about banRAB/artists.