"Written while the Byrds were on tour following the release of Sweetheart of the Rodeo, this Parsons-McGuinn-penned caricature showed up on the Byrds’ subsequent LP, Dr. Byrds and Mr. Hyde, after Parsons had left. "Gram and I were in a hotel room in London reminiscing about our encounter with Nashville D.J. Ralph Emery," McGuinn recalls. "We'd taken our single, ‘You Ain't Goin' Nowhere,’ to him in hopes of getting it played on WSM, a powerful clear-channel radio station. Ralph previewed the demo disk and said, ‘I'm not going to play that on my show!’ We asked why not and he demanded, ‘What’s it about?' I told him that it was a Bob Dylan song and no one knew what they were about. Ralph didn't think that was funny. He said, ‘Bob Dylan! If he wore green socks, everybody would wear green socks.’ We left the station feeling discouraged. So now in London, I suggested to Gram that we write a song about that experience. We decided that because Ralph had advertised truck seats on his show, he reminded us of a drugstore cowboy, only in his case a ‘Drugstore Truck Drivin' Man.’ "
From rocksbackpages.com/features/0009_parsons_scoppa.html
"Written while the Byrds were on tour following the release of Sweetheart of the Rodeo, this Parsons-McGuinn-penned caricature showed up on the Byrds’ subsequent LP, Dr. Byrds and Mr. Hyde, after Parsons had left. "Gram and I were in a hotel room in London reminiscing about our encounter with Nashville D.J. Ralph Emery," McGuinn recalls. "We'd taken our single, ‘You Ain't Goin' Nowhere,’ to him in hopes of getting it played on WSM, a powerful clear-channel radio station. Ralph previewed the demo disk and said, ‘I'm not going to play that on my show!’ We asked why not and he demanded, ‘What’s it about?' I told him that it was a Bob Dylan song and no one knew what they were about. Ralph didn't think that was funny. He said, ‘Bob Dylan! If he wore green socks, everybody would wear green socks.’ We left the station feeling discouraged. So now in London, I suggested to Gram that we write a song about that experience. We decided that because Ralph had advertised truck seats on his show, he reminded us of a drugstore cowboy, only in his case a ‘Drugstore Truck Drivin' Man.’ "