Tuning: Standard The song is a 12 bar blues in D. The pattern is essentially: I I I I IV IV I I V V I I with a small twist. Any bar that comes before a I is descending 4 chord pattern of D C G F. In this case, it is the 2nd bar, the 6th bard and the 10th bar. The intro is just the 1st 8 bars. INTRO Let me down, and close that box car door Yes, let me down, and close that box car door Well, I'm goin' back to Chattanooga, and sleep on sister Irene's door Solo Yes, I'm going down, I'm go (azchords.com)