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
['BGG AGE DGG', 'D2 c .B(dc) dgf dBG Bdd dBG', 'z c .B(dc) dgf dBG Bdd dBG']  
X:1
L:1/8
M:9/8
K:G
 d | BGG AGE DGG | BAG GFG Azd | BGG AGE DGG | cBA BGE D2 :| c | .B(dc) dgf dBG | Bdd dBG Azc | 
 Bdd dge dBG | cBA BGE D z || c | .B(dc) dgf dBG | Bdd dBG Azf |{a} gfe dBd cBA | cBA BGE D2 |]  