Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:6/8
K:Ddor
['FED E3', 'dcA c3', 'A,DE FED']  
X:1
L:1/8
M:6/8
K:Ddor
 D3 FED | E3 FDC | A,DE FED | E3 AGE | A,DE FED | E3 EFG | AGF GFE | FEC D3 :| d3 dcA | c3 cAG | 
 Add dcA | c3 edc | Add dcA | c3 cde | fed edc | dcA d3 :| A,DE FED | A,DE FED | _B,EF GFE | 
 _B,EF GFECFG AGF | CFG AGF | AGF GFE | FEC D3 :|  