Sam [Phillips] wanted I Walk The Line up - you know, up-tempo. And I put paper in the strings of my guitar to get that (vocalizing) sound, and with the bass and the lead guitar, there it was. Bare and stark, that song was when it was released. And I heard it on the radio and I really didn't like it, and I called Sam Phillips and asked him please not to send out any more records of that song.
