Create a series of chord progressions to improve the harmonic structure of the given music piece.
D/B,/ | A,>B,D D>ED | EFA B2 d/B/ | A>FD E>DE | FDB, B,2 D/B,/ | 
 A,>B,D D>ED | EFA d2 c/B/ | A>FD B,2 A, | B, D D D2 :| (3A/B/c/ | 
 d>fd ecA | B/A/B/c/d B/A/G/F/E/<D/ | E2 D/E/ F>ED | FDB, B,2 (3A/B/c/ | 
 d>af ec>A | B/A/B/c/d B/A/G/F/E/<D/ | E2 D/E/ F>DB, | 
 A,B,D D2 (3A/B/c/ | d>fd ec>A | B/A/B/c/d B/A/G/F/E/<D/ | 
 F/D/A/F/d/A/ B/A/G/F/E/<D/ | F2 E E>DB, | A,>B,D D>ED | EFA d>cB | 
 A>FD B,2 A, | B, D D D2 |]  
X:1
L:1/8
Q:1/8=120
M:6/8
K:D
 D/B,/ |"D" A,>B,D"Bm" D>ED |"Em" EFA"G" B2 d/B/ |"D" A>FD"Em" E>DE |"D" FDB,"G" B,2 D/B,/ | 
"D" A,>B,D"Bm" D>ED |"Em" EFA"G" d2 c/B/ |"D" A>FD"G" B,2 A, |"G" B,"Em7" D D"D" D2 :| (3A/B/c/ | 
"D" d>fd"A" ecA |"G" B/A/B/c/d B/A/G/F/E/<D/ |"Em" E2 D/E/"D" F>ED |"Bm" FDB,"Em7" B,2 (3A/B/c/ | 
"D" d>af"A" ec>A |"G" B/A/B/c/d B/A/G/F/E/<D/ |"Em" E2 D/E/"D" F>D"G"B, | 
"D" A,B,"Em7"D D2"D" (3A/B/c/ |"D" d>fd"A" ec>A |"G" B/A/B/c/d B/A/G/F/E/<D/ | 
"D" F/D/A/F/d/A/"G" B/A/G/F/E/<D/ |"D" F2"Em" E"A7" E>DB, |"D" A,>B,D"Bm" D>ED |"Em" EFA"G" d>cB | 
"D" A>FD"G" B,2 A, |"G" B,"Em7" D D"D" D2 |]  