Create a series of chord progressions to improve the harmonic structure of the given music piece.
| f | A3/2 A/ A B | d e f2 | e d B d | f e f a | A3/2 A/ A B | 
 d e f2 | e d B G | A2 A |] | z | a3/2 a/ a b | a g f2 | e d B d | 
 f e f a | a3/2 a/ a b | a g f2 | e d B G | A2 A |]  
X:1
L:1/4
M:2/2
K:D
"A" | f |"D" A3/2 A/ A B | d e"D7" f2 |"G" e d"Em" B d |"A7" f e f a |"D" A3/2 A/ A B | 
 d e"D7" f2 |"G" e d"Em" B G |"A7" A2 A |]"B" | z |"D" a3/2 a/ a b | a g f2 |"G" e d"Em" B d | 
"A7" f e f a |"D" a3/2 a/ a b | a g f2 |"G" e d"Em" B G |"A7" A2 A |]  