It's really difficult but I think I'd opt for February 1963 when I first heard "Freewheelin" at the age of 17, I do believe the hairs stood up on the back of my neck, I knew this was somebody special and almost 40 years on I'm even more convinced. There have been many great moments since then, most recently "Things Have Changed". Impossible question really, like trying to pick a favourite Dylan song, changes all the time.