Saw acoustic Hot Tuna do Operator a few years back. Think Jorma covered it on a recent album. So, kinda similar to the Bob and Phil thing. Tuna's version made me realize that the music to Operator is basically a rip off musically of Fishin Blues, the traditional popularized by Taj Mahal. Listen and compare.
Have enjoyed the Phil and Bob stuff a lot so far, nice review in Rolling Stone that captures the magic and misses pretty well. Think the set with Trey finally delivered on the hope that never came through at Fare Thee Well. When they opened up that Jack Straw, I felt a tingle go up my leg.