Compose harmonious chord progressions to enhance the existing musical composition.
"^A" z2 | BBBA GGGE | DDDB, D2G2 | FFFG A2Ac | BcBA G2D2 | BBBA GGGE | 
 DDDG B2Bd | DDDF A2BA | G2G2 G2 :|"^B" z2 | EGBe Begb | cec'b a2a2 | 
 bc'ba f^dfa | babg f2e2 | EGBe Begb | cec'b a2a2 | b2ba f^dgf | e2e2 e2 :| 
"^C" z2 | bagf edcB | dcec A2A2 | agfe d2dg | bagf e2d2 | bagf edcB | 
 dcec A2cg | f2fe AcBA | G2B2 G2 :|  
X:1
L:1/16
Q:1/4=80
M:2/4
K:G
"^A" z2 |"G" BBBA"C" GGGE |"G" DDDB, D2G2 |"D7" FFFG A2Ac |"G" BcBA G2D2 | BBBA"C" GGGE | 
"G" DDDG B2Bd |"D7" DDDF A2BA |"G" G2G2 G2 :|"^B" z2 |"Em" EGBe Begb |"Am" cec'b a2a2 | 
"B7" bc'ba f^dfa | babg"Em" f2e2 |"Em" EGBe Begb |"Am" cec'b a2a2 |"B7" b2ba f^dgf |"Em" e2e2 e2 :| 
"^C" z2 |"G" bagf edcB |"Am" dcec A2A2 |"D7" agfe d2dg |"G" bagf e2d2 |"G" bagf edcB | 
"Am" dcec A2cg |"D7" f2fe AcBA |"G" G2B2 G2 :|  