There is another song with a similar title "Moonlight on the Trail" that was written by Tim Spencer, one of the Sons of the Pioneers.

"Twilight on the Trail" has a complex melody and an advanced cord progression that gives it away as a Hollywood movie song, probably written by classically-trained musicains. Such songs are niclely mixed with trad folk songs and original compostions (such as Spencer's) to give Cowboy Music a lot of variety.