Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:9/8
K:D
['G FGA BAG', 'd2 e fde fga ecA Bcd AGF']  
X:1
L:1/8
M:9/8
K:D
 G | FGA BAG FED | FGA Bcd e2 G | FGA BAG FGA | Bgf edc d2 :: e | fde fga ecA | Bcd AGF E2 a | 
 bgb afd cBA | Bgf edc d2 :|  