Compose a piece of music that follows the specified structure and incorporates the given theme.
X:1
L:1/8
M:6/8
K:G
['dBd g3 d2 e', 'gfg efg abg fed'  
X:1
L:1/8
M:6/8
K:G
 GDG BGB | dBd g3 | d2 e dcA | ABG FED | GDG BGc | dBd g3 | d2 e dcB | AGF G3 :: gfg efg | 
 abg fed | efg dcB | ABG FED | gfg efg | abg fed | cea Bdg | AGF G3 :|  