Design various chord structures to improve the overall harmony of the assigned musical composition.
a | fed A2 d | B2 d A2 d | fed A2 d |{c} e3 e2 A | fed A2 d | B2 d A2 d | 
 BGd cAe |1 d3- d2 :|2 d3- dfg |: afd f2 a | fef def | gfg ecA | 
 gfg efg | afd f2 a | fef def | BGd cAe |1 d3- dfg :|2 d3- d2 d |: 
 dfd ege | faf d2 f | egc B2 A | faf e2 A | dfd ege | faf d2 A | 
 BGd cAe |1 d3- d2 d :|2 d3- d2 |]  
X:1
L:1/8
M:6/8
K:D
 a |"D" fed A2 d |"G" B2 d"D" A2 d |"D" fed A2 d |"A7"{c} e3 e2 A |"D" fed A2 d |"G" B2 d"D" A2 d | 
"G" BGd"A7" cAe |1"D" d3- d2 :|2"D" d3- dfg |:"D" afd f2 a |"D" fef def |"A7" gfg ecA | 
"A7" gfg efg |"D" afd f2 a |"D" fef def |"G" BGd"A7" cAe |1"D" d3- dfg :|2"D" d3- d2 d |: 
"D" dfd"A7" ege |"D" faf d2 f |"A7" egc B2 A |"D" faf"A7" e2 A |"D" dfd"A7" ege |"D" faf d2 A | 
"G" BGd"A7" cAe |1"D" d3- d2 d :|2"D" d3- d2 |]  