I always enjoyed the fact that one of the Dead's smoothest rolling, easy on the ears tunes does not rhyme.
Another one that sounds so naturally melodic that you don't question is Ripple. Jerry really finds the true rythym for the words. If somebody handed me the China Cat lyrics and told me to make it a song I wouldn't have known what to do. I certainly wouldn't sing it around the house
Might be a little off subject, but I figured, ya know, since we're on the subject...
"Stupid music makes people do stupid things"--Anthony From Bonnaroo