In the summer of 1970, Bill Danoff and Taffy Nivert were driving down Clopper Road to a family reunion in Gaithersburg, Maryland. Montgomery County was a much more rural place in those days, and the scenery inspired Danoff to repetitively sing “country roads, country roads, country roads.”
Under normal circumstances, this burst of creativity might have gone nowhere, but the couple happened to be a duo of professional musicians. So, with the help of John Denver, they soon turned the phrase into the earworm we know today.