Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:4/4
K:C
['c2 eg fddf ecgc B2 GB A2', 'C2 ef/g/ fe/d/ caac Bggf ecBG FaEg']  
X:1
L:1/8
M:4/4
K:C
|: c2 eg fddf | ecgc B2 GB | A2 GF EGfd | ef/g/ GB c2 C2 :: ef/g/ fe/d/ caac | Bggf ecBG | 
 FaEg Dfgf | ef/g/ GB cGEC :|  