Hi Malcolm, i feel this is not jamming, but you trying to learn songs in the moment, a huge task for any player.
In jamming there is a structure to interact with and that structure has to be knowing. That's different from trying to play catch up on someone.
Here is and example of jamming. About 3 years ago Blues player Buddy Whittington gave a clinic in the UK, at the time he was guitar player for the Legendary John Mayalls Bluesbreakers. We all meet him for the first time ever a few minutes before the clinic and then he went on. The structure was quickly explained before each song in that clinic then we jammed.
See the link for the results:
http://www.youtube.com/watch?v=21Oc1...eature=related
This happens because we all "Jam" within a structure that is "realised" by all, everything else is experience.
