This Circa Late 1970's-Early 1980's Country Music Song

Does anyone know which circa late 1970's-early 1980's Country Music song with the lyrics "The Nights Have Been So Lonely, Since You Went Away" as featured on this Radio Jingle Package Demo by JAM Creative Productions in Dallas, Texas; at 1:03?
http://www.jingles.com/audio/d_CountryKHJ.mp3

Right at the beginning: Anne Murray - Another Sleepless Night

Thank you so much for your assistance.