Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/4
M:3/4
K:C
['c G']  
X:1
L:1/4
M:3/4
K:C
 B/c/ e g | f e g | g/d/ c G | B c G | B/c/ e d | f c e | d/d/ c G | B c G |]  