Here are a few bits of Americana from a couple of Oxford American Southern Music samplers. The first two, taken from the same compilation (Vol. 6), are polar opposites.
Ann Savoy & Linda Ronstadt - La Chanson d'une Fille de Quinze Ans (Song of a Fifteen Year Old Girl)(mp3)
The Collins Kids - Hot Rod (mp3)
The Staple Singers - Will The Circle Be Unbroken (mp3)