"Leavin' on Your Mind" is a country pop song written by Wayne Walker and Webb Pierce, first recorded by Canadian singer Joyce Smith in 1962.
Patsy Cline was in Owen Bradley's office one day, heard the record Smith made, and immediately wanted the song for herself.
Unlike her earlier hits "Crazy" and "I Fall to Pieces", "Leavin' On Your Mind" stalled at #83 on the Billboard Hot 100 chart.
Cline had planned to include the song on her upcoming album, called Faded Love, along with two other singles to be released that year.
The song was featured on the ABC drama series Lost in episode three of the first season entitled "Tabula Rasa".