Create a series of chord progressions to improve the harmonic structure of the given music piece.
|: cd | efe dcB | A2 c E2 c | c^Bc edc | B3- B2 cd | efe dcB | A2 c E2 e | 
 gfe dcB | A3- A2 :: cd | e2 c a2 g | f2 d b2 a | gBB Bdf | e3- e2 cd | 
 e2 c a2 g | f2 d b2 a | gfe dcB | A3- A2 :|  
X:1
L:1/8
M:6/8
K:A
|: cd |"A" efe"E7" dcB |"A" A2 c E2 c | c^Bc"E7" edc | B3- B2 cd |"A" efe"E7" dcB |"A" A2 c E2 e | 
"E7" gfe dcB |"A" A3- A2 :: cd |"A" e2 c a2 g |"D" f2 d"Bm" b2 a |"E7" gBB Bdf |"A" e3- e2 cd | 
"A" e2 c a2 g |"D" f2 d"Bm" b2 a |"E7" gfe dcB |"A" A3- A2 :|  