Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/4
M:4/4
K:C
['G, G,']  
X:1
L:1/4
M:4/4
K:C
 G, G, G, A,/B,/ | C G, E, C, | C2 D2 | E4 | G, G, G, A,/B,/ | C G, E, C, | C2 D2 | E4 | 
 E E E/D/C/B,/ | A, A, A,2 | D D D/C/B,/A,/ | G,/G,/G,/G,/A,/B,/ C | C B, C2 | E E E/D/C/B,/ | 
 A, A, A,2 | D D D/C/B,/A,/ | G,/G,/G,/G,/A,/B,/ C | C B, C2 |]  