Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
Q:3/8=80
M:6/8
K:G
['D G2 B A2 c', 'c2 A']  
X:1
L:1/8
Q:3/8=80
M:6/8
K:G
|: D | G2 B A2 c | B2 A G2 g | dcB ABc | BAB G2 D | G2 B A2 c | BAB G2 g | fed Ad^c | d3 D2 :: d | 
 e2 c c2 e | d2 B B2 d | c2 A A2 c | B2 G AFD | cBA B2 G | c2 A def | g2 c BAG | DGF G2 :|  