Design various chord structures to improve the overall harmony of the assigned musical composition.
FAA dAA | BAB dAG | FAA dfe | dBB BAG | FAA dAA | BAB def | gfe dfe | 
 dBB B3 :: fbb faa | fef d2 e | fbb faa | fed ede | fbb afe | dBc def | 
 gfe dfe | dBB B3 :|  
X:1
L:1/8
M:6/8
K:D
"D" FAA dAA | BAB dAG | FAA dfe |"Bm" dBB BAG |"D" FAA dAA | BAB def |"G" gfe"D" dfe | 
"Bm" dBB B3 ::"Bm" fbb faa | fef"A7" d2 e |"Bm" fbb faa | fed"A7" ede |"Bm" fbb afe |"D" dBc def | 
"G" gfe"D" dfe |"Bm" dBB B3 :|  