From the extende

From the extended version on paper, Dylan crafted four verses and the chorus in Woodstock, New York.[6] The song was written on an upright piano in the key of G sharp and was changed to C on the guitar in the recording studio.[7] Dylan invited Mike Bloomfield, lead guitarist of the Paul Butterfield Blues Band, to play on the recording session. Asked by Dylan to visit his house in Woodstock for the weekend to learn new material, Bloomfield recalled: "The first thing I heard was 'Like a Rolling Stone'. I figured he wanted blues, string bending, because that's what I do. He said, 'Hey man, I don't want any of that B.B. King stuff'. So, OK, I really fell apart. What the heck does he want? We messed around with the song. I played the way that he dug, and he said it was groovy."[8]