Design various chord structures to improve the overall harmony of the assigned musical composition.
Ad dd | ^c2 A2 | ee ee | fe d2 | Ad dd | ^c2 A2 | ag fe | fe d2 || 
 A/d/f/a/ A/d/f/a/ | b2 g2 | bb bb | ag f2 | Aa aa | gf e2 | ag fe | 
 d2 d2 |]  
X:1
L:1/8
M:2/4
K:Dmin
"Dm" Ad dd |"A7" ^c2 A2 | ee ee |"Dm" fe d2 |"Dm" Ad dd |"A7" ^c2 A2 | ag fe |"Dm" fe d2 || 
"Dm" A/d/f/a/ A/d/f/a/ |"Gm" b2 g2 |"C7" bb bb |"F" ag f2 |"Dm" Aa aa |"Gm" gf e2 |"A7" ag fe | 
"Dm" d2 d2 |]  