Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:6/8
K:G
['eAA cAA eAA ABd', 'gfg efg']  
X:1
L:1/8
M:6/8
K:G
 eAA cAA | eAA ABd | eAA BdA | BGG GAB | eAA cAA | eAA ABd | efe/d/ B2 A | BGG G2 :: gfg efg | 
 aba/g/ fdd | gfg efg | afd d3 |1 gfg efg | aba/g/ fed | efe/d/ B2 A | BGG G2 :|2 efe/d/ efg | 
 faf fed | efe/d/ B2 A | BGG G2 ||  