Compose a piece of music that follows the specified structure and incorporates the given theme.
X:1
L:1/8
Q:3/8=120
M:6/8
K:G
['GAB D2', 'dcB efg'  
X:1
L:1/8
Q:3/8=120
M:6/8
K:G
 GAB D2 B | A2 G FED | GAB D2 D | E3 G3 :: dcB edc | dcB ABc | dcB efg | B3 d3 | dcB efg | 
 (f/g/a)B A2 G | Bcd D2 D | E3 G3 :|  