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 C2 C EEE DDD C3 G3']  
X:1
L:1/8
M:6/8
K:C
 C | C2 C EEE | DDD C3 | G3 E3 | c3 G3- | G3 FED | E G2- G2 G | AAA GGG | F2 F EEE | GGG GFD | 
 E C2- C2 ||  