Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:2/2
K:G
['d2 dd BGBd', 'G4 B2 B2 GE E2 c2 c2']  
X:1
L:1/8
M:2/2
K:G
|: d2 dd BGBd | BGBd dcAF | d2 dd BGBd | dcAF G4 :: B2 B2 GE E2 | c2 c2 AF F2 | d2 dd BGBd | 
 dcAF G4 :|  