Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:6/8
K:G
['g2 d BdB d2', 'f2 d e2 B d2']  
X:1
L:1/8
M:6/8
K:G
 g2 d BdB | d2 A Bde | g2 d BdB | d2 B ABe | g2 d BdB | d2 A Bde | f2 d e2 B | d2 B ABe :: 
 f2 d e2 B | d2 A Bde | f2 d e2 B | d2 B ABe | f2 d e2 B | d2 A Bde | fga efg |{e} d2 B ABe :|  