I Walk The Line

Johnny Cash songs were well known for the "Boom-Chicka" strumming pattern used here. That's a 8th note in the bass, followed by two 16th notes outlining the remainder of the chord.

Notice the way the bass tends to alternate between the root and the perfect 5th throughout the piece. This is a very common method of providing movement to a bassline, especially in older songs.

If you want to break this song down a little more, the chords we're working with here are E, A, D, and B7, all in the classic open shapes you should know by now. The riffing at the end of each bar is made up of one octave of the E major scale.

Transition between each of those chord shapes until it's smooth, play up and down the E major scale a few times, and then get comfortable with the "Boom-Chicka" pattern, and this song is in the bag.