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:Edor
['BE E2', 'B2 eB']  
X:1
L:1/8
M:4/4
K:Edor
|: BE E2 BAGA | BE E2 G2 GA | BE E2 BABd | gedB A2 GA :| B2 eB gBeB | B2 ed BAGA | B2 eB g3 g | 
 gedB A2 GA | B2 eB gBeB | B2 ed BAGA | (3Bcd ef g3 g | gedB A2 GA ||  