The melody of I Walk The Line by Johnny Cash runs 81 notes across 17 bars, 1:09 long in Bb at 128 beats per minute. The tab sits almost entirely in the first two frets, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? I Walk The Line chords and lyrics.