Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/4
Q:1/4=100
M:4/4
K:Cdor
['c c', 'C3 z C C D F G4']  
X:1
L:1/4
Q:1/4=100
M:4/4
K:Cdor
 G | c c c G | c2 c c | d c B G | c2 z c | d c B G | G2 G G | G G F D | C3 |: z | C C D F | G4 | 
 G G F D | C3 :|  