Very interesting, although the title's maybe a bit misleading: the fact that he matters is more or less taken as read. It's academic but very accessible and readable. The author's a classicist who also teaches on Dylan, and the focus is on Dylan's connections with/inspiration from the work of Virgil, Juvenal, etc. But if you're enough of a Dylan fan it'd probably be of interest to you even if the classics aren't. I have to admit I'm mainly a fan of the acoustic/folky first five albums, and my knowledge and appreciation of the later stuff is very patchy - but the book has encouraged me to revisit some of it and give it another go.