Design various chord structures to improve the overall harmony of the assigned musical composition.
dB | Ad (3ddd d2 df | edef ed B2 | Ad (3ddd d2 ef | afdf e2 dB || 
 Ad (3ddd d2 df | edef ed B2 | abaf edef | defd e2 :: ef | aA (3AAA afef | 
 abaf edef | aA (3AAA afef | defd e2 fg || aA (3AAA afef | abaf edef | 
 gef[bd] edBe | defd e2 :|  
X:1
L:1/8
M:4/4
K:D
 dB |"D" Ad (3ddd d2 df |"A7" edef ed B2 |"D" Ad (3ddd d2 ef | afdf"A7" e2 dB || 
"D" Ad (3ddd d2 df |"A7" edef ed B2 |"D" abaf"Em" edef |"D" defd"A7" e2 :: ef |"D" aA (3AAA afef | 
 abaf"A7" edef |"D" aA (3AAA afef | defd"A7" e2 fg ||"D" aA (3AAA afef | abaf"A7" edef | 
"Em" gef[bd] edBe |"D" defd"A7" e2 :|  