I'd say for country songs—I assume you mean commercial country music—to have become “traditional” they'd have to be old enough to have entered into living tradition, not just show up on some radio station's moldy oldies list.Some of the most enduring country music that has entered into living tradition would include the songs of the Original Carter Family. Your instrumentation is about right for their songs and many more recent country artists have released versions of their material. Carter Family material is known to a wide audience so the songs will sound familiar to your listeners. (Although many people who like Carter Family songs haven't heard of the Carter Family.)
Popular Carter Family songs include:
- Angel Band
- Beautiful Brown Eyes
- Bury Me Beneath the Willow
- Can The Circle Be Unbroken
- Foggy Mountain Top
- Give Me the Roses While I Live
- Gold Watch and Chain
- Homestead on the Farm
- I'll Be All Smiles Tonight
- I'm Sitting on Top of the World
- I'm Thinking Tonight of My Blue Eyes
- Jimmy Brown the Newsboy
- Keep on the Sunny Side
- Little Darling Pal of Mine
- The Maple on the Hill
- Oh, Death
- Oh, Take Me Back
- Wabash Cannonball
Other country performers who's music might be considered traditional include Johny & Jack, Hank Willims, Wilma Lee & Stony Cooper, The Maddox Brothers & Rose, Ernest Tubb, Jimmie Rodgers.
Good luck and let us know when you have some worked up. I'd love to hear some.
- Mark