In jam rock, the line between imitation and evolution can be woefully blurry. Often, the farther the bands and the scene get from the Grateful Dead seed, the harder the listener has to work in order to derive an original experience from the music.
Driving drums, noodling bass, swirling guitars and thin vocals rushing through stoner lyrics - we've all been there. And by and large, we like it there. Comfort candy for the ears.
But back at the source, something old is new again. Welcome to the Swamp.