Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:6/8
K:C
['C CEG G/ A3/2 G GFD C2']  
X:1
L:1/8
M:6/8
K:C
 C | CEG G/ A3/2 G | GFD C2 (E/G/) | cdc | G/ B3/2 d | c3- c z G | c2 c G2 E | FGA G2 C | 
 E G3/2 A/ G3/2 F/ D | C3- C2 ||  