Develop an appropriate set of chord transitions to enhance the existing music piece.
AG | FDFG A2A2 | defe dcBA | B2GB A2FA | GFE2 E2AG | FDFG A2A2 | defe dcBA | 
 d2d2 efge | f2d2 d2 :: fg | a2fa g2eg | f2df ecA2 | =c2c2 efge | 
 =c2c2 efge | a2fa g2eg | f2df ecA2 | d2d2 efge | f2d2 d2 :|  
X:1
L:1/16
M:2/4
K:D
 AG |"D" FDFG A2A2 |"D" defe dcBA |"G" B2GB"D" A2FA |"A7" GFE2 E2AG |"D" FDFG A2A2 |"D" defe dcBA | 
"G" d2d2"A7" efge |"D" f2d2 d2 :: fg |"D" a2fa"A7" g2eg |"D" f2df"A7" ecA2 |"C" =c2c2 efge | 
"C" =c2c2 efge |"D" a2fa"A7" g2eg |"D" f2df"A7" ecA2 |"G" d2d2"A7" efge |"D" f2d2 d2 :|  