Create a series of chord progressions to improve the harmonic structure of the given music piece.
|:"^A" G2g2 d2c2 | c2 B4 A2 | G2g2 d2c2 | c2 B4 G2 | f2>g2 _agfg | _agfe d2c2 | 
 BcdB c2BA | G8 ::"^B" g4- g2d2 | g4- g2d2 | g2>d2 g2>d2 | g2>d2 g4 |{a} b2b2 a2g2 | 
{a} b2b2 a2g2 | d'4 c'2b2 | abc'b a2g2 |{a} b2b2 a2g2 | ^fgag f2e2 | d^cde d=cBA |1 
 G2>A2 Bc (3de^f :|2 G8"^C" |: B4 c4 | d2 B4 B2 | e2>d2 e2g2 | g2{f} f6 | 
 f2>g2 _agfg | _agfe d2cB | BcdB c2BA |1 G2AB cdeg :|2 G8 |]:"^D" g4- gf=ef | 
 g6 d2 | gdgd b2ag | .g4 z4 | fggf fggf | bagf edcB | BccB BAAG | G8 :: 
"^E" c'ggc' c'bba | bffb baag | gabc' baga | b8 | c'ggc' c'bba | 
 bffb baag | gabc' baag | g8 ::"^F" g4- gd^cd | g4- gd^cd | gd^cd gd^cd | 
 gd^cd g4 | fg_ag fedc | cfcf c4 | BcdB c2BA | B4 b2 z2 | fg_ag fedc | 
 cfcf c4 | dccB BAAG | G8 :|  
X:1
L:1/16
M:2/4
K:Gmin
|:"^A""Gm" G2g2 d2c2 | c2 B4 A2 | G2g2 d2c2 | c2 B4 G2 |"Bb" f2>g2 _agfg | _agfe d2c2 | 
"D7" BcdB c2BA |"Gm" G8 ::"^B""Gm" g4- g2d2 | g4- g2d2 | g2>d2 g2>d2 | g2>d2 g4 |{a} b2b2 a2g2 | 
{a} b2b2 a2g2 | d'4 c'2b2 | abc'b a2g2 |{a} b2b2 a2g2 |"Cm" ^fgag f2e2 |"D7" d^cde d=cBA |1 
"Gm" G2>A2 Bc (3de^f :|2"Gm" G8"^C" |:"Bb" B4 c4 | d2 B4 B2 |"Eb" e2>d2 e2g2 |"Bb" g2{f} f6 | 
 f2>g2 _agfg | _agfe d2cB |"D7" BcdB c2BA |1"Gm" G2AB cdeg :|2"Gm" G8 |]:"^D""Gm" g4- gf=ef | 
 g6 d2 | gdgd b2ag | .g4 z4 |"Bb" fggf fggf | bagf edcB |"D7" BccB BAAG |"Gm" G8 :: 
"^E""Cm" c'ggc' c'bba |"Bb" bffb baag |"F7" gabc' baga |"Bb" b8 |"Cm" c'ggc' c'bba | 
"Bb" bffb baag |"D7" gabc' baag |"Gm" g8 ::"^F""Gm" g4- gd^cd |"Gm" g4- gd^cd | gd^cd gd^cd | 
 gd^cd g4 |"Bb" fg_ag fedc |"Cm" cfcf c4 |"B" BcdB"F7" c2BA |"Bb" B4 b2 z2 |"Bb" fg_ag fedc | 
"Cm" cfcf c4 |"D7" dccB BAAG |"Gm" G8 :|  