There seemed to be a bit of a Older/ Younger Brother thing going w/ Jerry and Bobby. In a good way of symbiotic friendship, like brotherly love. With the music, although Bobby is a great rhythm guitarist, psychedelic rock star, he was seldom the most savvy musician in the room. Jerry just takes off in the space available while Bobby's not noticeably in that part of the mix (3:20-6:55 Jack Straw.) At the least, it is interesting to hear the music change. Got other moments where Bobby wasn't in the mix? Nothing personal Bobby, just like the variety, especially with Jerry.