The recording of this song is in the key E minor,
for most of the song is jumps between the
Em and an F#dim, as so:

  Em               F#dim                   B
e(7)------7x-----|(8)-------------|\      |7----7----|7----7----|
B(8)------8x-----|(10)-----10~~~~~| \     |7----7----|7----7----|
G(9)------9x-----|(11)---------11~|    |8----8----|8----8----|o
D(9)------9x-----|(10)------------|  /    |(b9)---(b9)---|(b9)---(b9)---|o
A-7~~~~~~~~x-----|(9)--9~~~~~~~~~~| /     |(b9)---(b9)---|(b9)---(b9)---|
E----------------|----------------|/      |7----7----|7----7----|
  Go                           Tell...     Gun      
                                        
  A       B        Em      C             
E-5-------7------|-7-------3------|\
B-5-------7------|(8)-----(5)-----| \
G(6)-----(8)-----|-(b9)------5------|  
D-7-------(b9)-----|-(b9)------5------|  /
A-7-------(b9)-----|-7-------3------| /
E-5-------7------|-7-------3------|/
 look-   sky      Tricks   mind
   ing     plays     on
    at               your 
      the 


     The Greenhornes