Create a series of chord progressions to improve the harmonic structure of the given music piece.
FG | A2 F A- ADFA | B2 GB- BDGB | A2 FA- ADFA | EFGA GFED | A2 FA- ADFA | 
 B2 GB- BDGB | ABcd efge | f2 d2 d2 :| de | f2 d f- ffd fd | gfaf gfed | 
 f2 d f- fd fd | eaca Aage | f2 d f- fd fd | gfaf gfed | ABcd efge | f2 d2 d2 :|  
X:1
L:1/8
Q:1/4=160
M:4/4
K:D
 FG |"D" A2 F A- ADFA |"G" B2 GB- BDGB |"D" A2 FA- ADFA |"A" EFGA GFED |"D" A2 FA- ADFA | 
"G" B2 GB- BDGB |"A" ABcd efge | f2 d2 d2 :| de |"D" f2 d f- ffd fd |"G" gfaf gfed | 
"D" f2 d f- fd fd |"A" eaca Aage |"D" f2 d f- fd fd |"G" gfaf gfed |"A" ABcd efge | f2 d2 d2 :|  