that's my kind of jam. Unfortunately, it seems that many "jams" these days are just about playing known (and already-overplayed) blues-rock songs as close as possible to the most-popular post-1970 version, while some guy spins endless solos. I recently played bass at a "jam". We started on a well-known and far-to-often-played classic rock number; it was boring as hell, so I started changing it up a bit. One or two of the guys got it right away, the rest were confused. Some of them followed along, and some of them looked pissed off, laid their guitars down and walked away. Some even made a comment about "waste of time, f---ing disaster..."