Wagon Wheel began as a mumbled 1973 Bob Dylan outtake from the Pat Garrett and Billy the Kid sessions, reached a homesick teenager named Ketch Secor through a bootleg cassette his friend Critter Fuqua bought in London, and grew verses about a hitchhiker headed to Raleigh. This episode traces the song from its blues roots to Old Crow Medicine Show's 2004 release and Darius Rucker's diamond-certified 2013 hit.

We look at the copyright search that revealed Dylan's chorus drew on Arthur Big Boy Crudup, Big Bill Broonzy, Curtis Jones and Lil' Son Jackson, the 50-50 co-writing split Secor defends, the venues that banned the song, Rucker's win at the 2014 Grammys, Nathan Carter's 52 weeks on the Irish singles chart, and the song's odd afterlife with soccer teams, an English football club and politicians on both sides.

• The geographic err ...