Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/4
M:4/4
K:G
['c B']  
X:1
L:1/4
M:4/4
K:G
 G3/2 B/ d d | d d B G | e3/2 d/ c B | A d d2 | A3/2 c/ c B | d A A G | G e d c | B A G2 | 
 A3/2 c/ c B | d A A G | G e d c | B A G2 |]  