Tom Petty: 'He [Bob Dylan] gave us a kind of courage that we never had, to learn something quickly and go out on stage and play it. You had to be pretty versatile because arrangements could change, keys might change, there’s just no way of knowing exactly what he wants to do each night. You really learnt the value of spontaneity, of how a moment that is real in a concert is worth so much more than one you plan out.'