Create a series of chord progressions to improve the harmonic structure of the given music piece.
|: A | F A A | B A A | F A d | f2 e/f/ | g e c |1 A c e | g f e | f2 :|2 A B c | 
 d3- | d2 a |: b a f | A d f | a g f | g2 e/f/ | g e c |1 A c e | g f e | f2 a/a/ :|2 
 A B c | d3- | d2 ||  
X:1
L:1/4
M:3/4
K:D
|: A |"D" F A A | B A A | F A d | f2 e/f/ |"A7" g e c |1"A7" A c e | g f e |"D" f2 :|2"A" A B c | 
"D" d3- | d2 a |:"D" b a f | A d f | a g f |"A7" g2 e/f/ | g e c |1 A c e | g f e |"D" f2 a/a/ :|2 
"A7" A B c |"D" d3- | d2 ||  