My guest today is Jim Windolf, who joins me to discuss 'Where The Music Had to Go - How Bob Dylan and The Beatles Changed Each Other - and the World'.

Jim's book looks at the entwining careers of two of the 20th Century's most important musical artists, and details known meetings through the 60's and beyond - From Lennon's and McCartney's lyrical transformations to George Harrison's growth as a songwriter, Jim showcases the ripple effects of the Beatles-Dylan connection.