Create a series of chord progressions to improve the harmonic structure of the given music piece.
|: CEG | c2 BG _B2 AF | _A2 GF EF G2 | z _AGF GABG | Bc G2 z C/E/ G/C/E/G/ | c2 BG _B2 AF | 
 _A3 _d- (3dc_B (3AGF | G2 E>C D/^C/D/F/ E/D/=C/B,/ | C4"^fine" z :| ^F,/G,/ _A,/=A,/_B,/=B,/ | 
 |: C/B,/C/E/ D/^C/D/F/ E/^D/E/G/ F/E/F/A/ | G4 z CEG | BcG>E F/E/F/A/ G/F/E/D/ | 
 ^D E3 z B,/C/ ^C/=D/^D/E/ | F_AGF GABc | _d2 d2 (3dc=B (3_AGF | G2 E>C D/=B,/D/F/ E/D/C/B,/ |1 
 C/c/B/A/ G/A/G/F/ E/F/D/E/ C/G,/A,/B,/ :|2 C4 z |] |: _B,_EF | G3 F/_E/ F3 _B | 
 _B/_A/A/G/ G/F/F/_E/ ^F G2 =B- | B2 _B_A GA B=B | _A4 z F^FG | _A_GF_E =E F2 F | 
 F/E/_D/E/ D/C/_B,/A,/ B,4 | (3F,_B,C (3_DCB, (3EFG (3E-ED |1 C2 z2 z :|2 C2 C2 E2 G2 |]  
X:1
L:1/8
M:4/4
K:C
"A" |: CEG | c2 BG _B2 AF | _A2 GF EF G2 | z _AGF GABG | Bc G2 z C/E/ G/C/E/G/ | c2 BG _B2 AF | 
 _A3 _d- (3dc_B (3AGF | G2 E>C D/^C/D/F/ E/D/=C/B,/ | C4"^fine" z :| ^F,/G,/ _A,/=A,/_B,/=B,/ | 
"B" |: C/B,/C/E/ D/^C/D/F/ E/^D/E/G/ F/E/F/A/ | G4 z CEG | BcG>E F/E/F/A/ G/F/E/D/ | 
 ^D E3 z B,/C/ ^C/=D/^D/E/ | F_AGF GABc | _d2 d2 (3dc=B (3_AGF | G2 E>C D/=B,/D/F/ E/D/C/B,/ |1 
 C/c/B/A/ G/A/G/F/ E/F/D/E/ C/G,/A,/B,/ :|2 C4 z |]"C" |: _B,_EF | G3 F/_E/ F3 _B | 
 _B/_A/A/G/ G/F/F/_E/ ^F G2 =B- | B2 _B_A GA B=B | _A4 z F^FG | _A_GF_E =E F2 F | 
 F/E/_D/E/ D/C/_B,/A,/ B,4 | (3F,_B,C (3_DCB, (3EFG (3E-ED |1 C2 z2 z :|2 C2 C2 E2 G2 |]  