Al Kooper talks working on 'Like a Rolling Stone'

Al Kooper performed during rehearsals for the "I'm Not There" Benefit Concert at the Beacon Theater Nov. 7, 2007, in New York City.
Rob Loud | Getty Images 2007
Today's Morning Edition music is from 50 years ago Tuesday, when Bob Dylan returned to the studio to continue work on his new song "Like a Rolling Stone."
On this day a new musician was on hand, a friend of producer Tom Wilson named Al Kooper.
Kooper more or less sneaked into the session and added an organ part even though he was really a guitar player.
He talked about the experience in the documentary "No Direction Home."
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