Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:2/2
K:Amix
['|{c} BAGE']  
X:1
L:1/8
M:2/2
K:Amix
 gfed cBAG |{c} BAGE A2 E2 |{a} gfed cBAG |{c} BAGE F2 D2 :: cded cA A2 |{c} BAGB A3 B |1 
 cd{a}ed cA A2 |{c} BAGE F2 D2 :|2 cdef g3 e | cAGE F2 D2 ||  