Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/4
M:4/4
K:C
['C2 C (A,']  
X:1
L:1/4
M:4/4
K:C
 E G2 E | C4 | E C2 C | (A, G,3) | C C2 C | (A, G,) A, C | E E2 D | C4 |]  