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:C
["c'ag e2 d ecA c2 d"]  
X:1
L:1/8
M:6/8
K:C
"C" c'ag e2 d | ecA c2 d |"C" ege"F" ded |"G" ceg a2 b |"C" c'ag e2 d | ecA c2 d |"C" ege"F" dcd | 
"G" ecB"C" c3 ::"C" gab c'bc' |"Dm" ad'd' ad'd' |"Am" e'd'c' a2 g |"F" abc' abc' |"C" gab c'bc' | 
"G" d'bg abc' |"F" age dcd |"G" ecB"C" c3 :|  