Conversation so far:
What is some background on Highway 61?
Highway 61 Revisited was recorded in two blocks of recording sessions that took place in Studio A of Columbia Records, located in Midtown Manhattan.
What year was Highway 61 revisited?
1965.
Was anyone featured on Highway 61?
The first block, June 15 and June 16, was produced by Tom Wilson and resulted in the single "Like a Rolling Stone".
Did he record any other hits after highway 61?
CANNOTANSWER.

Question: Why was the album recorded in two blocks?
Self-contained rewrite: Why was Highway 61 recorded in two blocks?