Create a series of chord progressions to improve the harmonic structure of the given music piece.
"^A" E2 |: A2 eA aAeA | A2 eA dBGB | A2 eA aAe^f | g2 ge dBGB :| 
"^B" (3cBAeA (3cBAeA | (3cBAeA dBGB | (3cBAeA (3cBAeA | g2 ge dBGB :| 
"^C" A2 eA aAeA | aAeA dBGB | A2 eA aAeA | g^fge dBGB :|"^D" ceAe ceAe | 
 ceAe dBGB | ceAe ceAe | g^fge dBGB :|  
X:1
L:1/8
M:4/4
K:Amin
"^A" E2 |:"Am" A2 eA aAeA |"Am" A2 eA"G" dBGB |"Am" A2 eA aAe^f |"G" g2 ge dBGB :| 
"^B""Am" (3cBAeA (3cBAeA |"Am" (3cBAeA"G" dBGB |"Am" (3cBAeA (3cBAeA |"G" g2 ge dBGB :| 
"^C""Am" A2 eA aAeA |"Am" aAeA"G" dBGB |"Am" A2 eA aAeA |"G" g^fge dBGB :|"^D""Am" ceAe ceAe | 
"Am" ceAe"G" dBGB |"Am" ceAe ceAe |"G" g^fge dBGB :|  