It's hardly a secret -- all one has to do is listen to melody and lyric -- that many Carter Family songs were originally commercial and urban. But A. P. Carter rewrote freely and at times radically, and sometimes the folk process had already done that before Carter collected the material. Moreover, the Carter Family arrangements and harmonies were far removed from the pop originals.

See

http://www.bluegrassmessengers.com/original-carter-family-songs--alphabetical-order.aspx