Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:2/2
K:C
['c2 GE', 'g2 eg cgeg']  
X:1
L:1/8
M:2/2
K:C
|: c2 GE c2 GE | Dedc BGAB | cded cBcA | GcGE GcGE | c2 GE c2 GE | Dedc BGAB | cded cBcA | 
 GAGE Gc c2 :| g2 eg cgeg | a2 fa dafa | g2 eg cgeg | fagf ec c2 | g2 eg cgeg | a2 fa dafa | 
 gfed cBcA | Gagf ec c2 :|  