Witchita Lineman is the ultimate country/pop crossover track - written by Jimmy Webb for the Country star Glen Campbell.

Released in 1968, it tells the story of a lonely lineman in the American Midwest, travelling vast distances to mend power and telephone lines. It's been covered many times, but Glen’s version remains the best loved and most played.

Johnny Cash also recorded an extraordinary and very raw version. Peter Lewry, a lifelong Cash fan, describes how it came about.

David Crary is a lineman from Oklahoma, who recalls his reaction to the first time he heard the song. Meggean Ward's father was a lineman in Rhode Island. As a child she always felt it was written for him.

Glen Campbell is also interviewed.

Shortly after it was recorded, he went public about his diagnosis of Alzheimer's. His contribution is brief, but it includes an acoustic performance of the song. It was a privilege to record ‘down the line’.

Series exploring famous pieces of music and their emotional appeal.

Producer: Karen Gregor.

First broadcast on BBC Radio 4 in August 2011.