Develop an appropriate set of chord transitions to enhance the existing music piece.
(3A/B/c/ | dd ef | df eA | dd ef | d2 c2 | dd ef | gf ed | cA Bc | d2 d :: A | 
 B>c BA | Bc dB | A>B AG | F2 A2 | B>c BA | Bc dB | Ad ce | d2 d :|  
X:1
L:1/8
M:2/4
K:D
 (3A/B/c/ |"D" dd ef | df eA | dd ef | d2"A7" c2 |"D" dd ef |"G" gf ed |"A7" cA Bc |"D" d2 d :: A | 
"G" B>c BA | Bc dB |"D" A>B AG | F2 A2 |"G" B>c BA | Bc dB |"D" Ad"A7" ce |"D" d2 d :|  