Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:6/8
K:D
['FED FAF FEF DFA dAF', 'fed edc']  
X:1
L:1/8
M:6/8
K:D
|: F3 FED | FAF FEF | DFA dAF | A,2 A, A,3 | F2 F FED | FAF FEF | DFA dAF |1 A,CE D2 E :|2 
 A,CE D2 g |: fed edc | dcd AFA | fed edc | dfb a2 g | fed edc | d3 AFE | DFA dAF |1 A,CE D2 g :|2 
 A,CE D2 E ||  