Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:6/8
K:Ddor
['EAA cAG EDE', 'Add fed']  
X:1
L:1/8
M:6/8
K:Ddor
 G | EAA cAG | EDE GED | EAA cAG | EDE ABc | EAA cAG | EDE GED | d/e/dB c2 A | GED D2 :| A | 
 Add fed | ede cAG | Add fed | cAG EDE | Add fed | ede cAG | d/e/dB c2 A | GED D2 :|  