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:Amix
['A3 AGE', 'd (3Bcd']  
X:1
L:1/8
M:6/8
K:Amix
|: A3 AGE | cde dBG | A3 AGE | E E3 GAB | A3 AGE | cde dBG | cBA BAG |1 EFG A2 G :|2 EFG A2 B |: 
 cee cee | ceg edc | B.g.g g2 d | (3Bcd g dBG | cBc d (3Bcd | ede a2 g | edc BAG |1 EFG A2 B :|2 
 EFG A3 ||  