Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:6/8
K:G
['', 'fed cAG', 'f2 g agf e2', 'e f2 g e2 f d2 e']  
X:1
L:1/8
M:6/8
K:G
 de |: fed cAG | A2 d cAG | F2 D DED | FEF GFG | A3 cAG | AGA cde | fed cAG | Ad^c d2 e :: 
 f2 d d^cd | f2 g agf | e2 c cBc | e2 f gfe | f2 g agf | e2 f gfe | fed cAG | Ad^c d2 e :| 
 f2 g e2 f | d2 e c2 d | ABA GAG | FGF FED | c3 cAG | AGA cde | fed cAG |1 Ad^c d2 e :|  