Create a series of chord progressions to improve the harmonic structure of the given music piece.
"^A" A AA | dd dA ff f(d | g)g ge bb bg | aa af gg ge | ff f x x ::"^B" c' c'c' | 
 c'b bg gc' c'c' | c'a af fa aa | ag ge eb ag | a4 z c' c'c' | c'b bg gc' c'c' | 
 c'a af fa aa | ab ga fg ef | d4"^Fine" z :|[K:D]"^C" A Bc | dd fe dd cB | 
 cc ed cc BA | BB dc BB AG | AA A z z ::"^D" f ga | b2 c'b c'b c'b | a2 ba ba ba |1 
 g2 ag ag ag | f4 z :|2 g2 ag ag fe | d4 z :|[K:Dmin]"^E" d ed | ^cc cc BB BB | 
 AA AA dd dd | ^cc cc ff ff | d4"^Da capo al fine" z |]  
X:1
L:1/8
Q:1/2=88
M:2/2
K:Dmin
"^A" A AA |"Dm" dd dA ff f(d |"G" g)g ge bb bg |"A" aa af gg ge |"Dm" ff f x x ::"^B" c' c'c' | 
"C7" c'b bg gc' c'c' |"F" c'a af fa aa |"A7" ag ge eb ag |"Dm" a4 z c' c'c' |"C7" c'b bg gc' c'c' | 
"F" c'a af fa aa |"A7" ab ga fg ef |"Dm" d4"^Fine" z :|[K:D]"^C" A Bc |"D" dd fe dd cB | 
"A" cc ed cc BA |"G" BB dc BB AG |"D" AA A z z ::"^D" f ga |"G" b2 c'b c'b c'b |"D" a2 ba ba ba |1 
"A7" g2 ag ag ag |"D" f4 z :|2"A7" g2 ag ag fe |"D" d4 z :|[K:Dmin]"^E" d ed |"A" ^cc cc BB BB | 
"Dm" AA AA dd dd |"A7" ^cc cc ff ff |"Dm" d4"^Da capo al fine" z |]  