Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:4/4
K:C
['', 'G2 c BAG Bcd', 'g fed', 'g fed']  
X:1
L:1/8
M:4/4
K:C
 ||[M:9/8][K:G] abc .D | G2 c BAG Bcd | ecA ABG FED | G2 c BAG Bcd | efg faf g2 :| g | 
 fed d2 g fed | ecA ABG FED | fed d2 g fed | efg faf g2 || g | fed d2 g fed | ecA ABG FED | 
 G2 c BAG Bcd | efg faf g2 |]  