Develop an appropriate set of chord transitions to enhance the existing music piece.
|: B | AFA AFA | BGB BdB | AFA Ade | fed BdB | AFA AFA | BGB BAB | def afe | 
 fed B2 :: A | def afa | baf afe | def afe | fed B2 A | def afa | baf a2 f | gag fgf | 
 edB B2 :: A | d2 f fef | fef fef | d2 f fef | edB B2 A | d2 f fef | fef fef | 
 gaf fgf | edB B2 :: Add fdd | edd fdd | Add fdd | edB B2 A | Add fdd | edd f2 f | 
 gag fgf | fdB B2 :|  
X:1
L:1/8
M:6/8
K:D
|: B |"D" AFA AFA |"G" BGB BdB |"D" AFA Ade |"Bm" fed BdB |"D" AFA AFA |"G" BGB BAB |"D" def afe | 
"Bm" fed B2 :: A |"D" def afa | baf afe | def afe | fed B2 A | def afa | baf a2 f |"G" gag"D" fgf | 
"A" edB B2 :: A |"D" d2 f fef | fef fef | d2 f fef | edB B2 A | d2 f fef | fef fef | 
"G" gaf"D" fgf |"A" edB B2 ::"D" Add fdd | edd fdd | Add fdd | edB B2 A | Add fdd | edd f2 f | 
"G" gag"D" fgf |"A" fdB B2 :|  