Create a series of chord progressions to improve the harmonic structure of the given music piece.
B |: AF Ad cB AG | F2 (3DFD E2 D2 | AF Ad BG Bd | cA Bc d3 B | 
 AF Ad cB AG | F2 (3DFD E2 D2 | AF Ad BG Bd |1 cA Bc d3 B :|2 
 cA Bc de fg |: a2 fd fa fd | fa (3gbg e3 f | ge (3ege c2 ag | 
 fg fe de fg | a2 fd fa fd | fa (3gbg e3 f | ge (3ege c2 ag | 
 fa fe d4 :|  
X:1
L:1/8
M:4/4
K:D
 B |:"D" AF Ad"A7" cB AG |"D" F2 (3DFD"A7" E2 D2 |"D" AF Ad"G" BG Bd |"A7" cA Bc"D" d3 B | 
"D" AF Ad"A7" cB AG |"D" F2 (3DFD"A7" E2 D2 |"D" AF Ad"G" BG Bd |1"A7" cA Bc"D" d3 B :|2 
"A7" cA Bc"D" de"A7" fg |:"D" a2 fd fa fd | fa (3gbg"A7" e3 f | ge (3ege c2 ag | 
"D" fg"A7" fe"D" de"A7" fg |"D" a2 fd fa fd | fa (3gbg"A7" e3 f | ge (3ege c2 ag | 
"D" fa"A7" fe"D" d4 :|  