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:G
['B2 d dBA', 'G GED']  
X:1
L:1/8
M:9/8
K:G
|: B2 d dBA AGE | D2 D DEF G2 A | B2 d dBA dBA | Bdd dgf d3 | B2 d dBA AGE | D2 D DEF GBd | 
 deg ged dcB | ADd B2 A |1 G2 A :|2 GFE |: D2 G GED GED | E2 G GED ABG | D2 G GED GED | 
 A2 A ABc dBG | D2 G GED GED | E2 G GED ABG | D2 G GED GAB | d2 e B2 A |1 G2 E :|2 G3 ||  