IMO the biigest difference in the two is while jam just jams for the jam's sake, prog, at least in the beginning, was about making "artistcally relevant music". So most prog is more grandiose in nature, whereas jam bands just jam, they don't necessarily try to make a statement about the virtuoso players in the band they just make extended jams.
Last edited by cledussnow; 05-15-2012 at 03:54 PM.
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