Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:6/8
K:G
['DGd B2 B', 'c2 c BcB ABG FED', 'DED FED DAB cBA']  
X:1
L:1/8
M:6/8
K:G
|: DGd B2 B | DGd B2 B | cBc ABc | BAG FED | DGd B2 B | DGd B2 B | cBc Adc | AGF G3 :: c2 c BcB | 
 ABG FED | ded cdc | BAG A2 B | c2 c BcB | ABG FED | DED ABc | AGF G3 :: DED FED | DAB cBA | 
 d2 d cdc | BAG ABA | DED FED | DAB cBA | cBc Adc | AGF G3 :|  