Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
Q:1/2=90
M:2/2
K:G
['D2 G2 BABG AcBd', 'g2 G2 FG AB A2']  
X:1
L:1/8
Q:1/2=90
M:2/2
K:G
 D2 G2 BABG | AcBd cBAG | D2 G2 BABG | AcBd c2 g2 | D2 G2 BABG | AcBd c2 BA | BdcB AcBA | 
 BGAF G4 :: efgd Bd g2 | G2 FG AB A2 | (ef)(gf) (ef) g2 | G2 FG AB A2 | efgd BdeG | FGAB c2 BA | 
 BdcB AcBA | BGAF G4 :|  