Question: Idiot Wind was written after Bob Dylan's comeback tour with the group that formed in which city in 1968?
Sentence (from "Bob Dylan and the Grateful Dead 1987 Tour"): Each concert began with one or two lengthy sets by the Grateful Dead of their own material (sometime broken into a first and second set, per the Dead's own practice), followed by a roughly 90 minute set of the Dead acting as Dylan's backup band.
Relevant evidence: No