I Walk The Line by Johnny Cash is in Bb at 128 beats per minute and runs 1:09 across 17 bars. It uses 8 chords — F6, F#dim7, Gm7, C7, F, Bb, Dm7, F7. The chord diagram changes as the song plays and the words light up as they are sung, so you can strum and sing along without reading ahead.
Want the melody line note by note? I Walk The Line guitar melody tab.