Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:6/8
K:Edor
['BEE BEE d2 f edB BAF', 'Bef gfe fgf edB BAF', 'E3 last four bars, especially the last']  
X:1
L:1/8
M:6/8
K:Edor
 BEE BEE | d2 f edB | BAF FEF | DFA BAF | BEE BEE | d2 f edB | BAF dAF | FED E3 :: Bef gfe | 
 fgf edB | BAF FEF | DFA BAF | Bef gfe | fgf edB | BAF dAF | FED E3 :| 
"^Optional last four bars, especially the last time through the tune" BEE BEE | d2 f edB | 
 BAF dAF | FED E3 |]  