Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:4/4
K:D
['dA (3AAA defd eB (3BBB efge fa', 'efge fa (3aaa afec']  
X:1
L:1/8
M:4/4
K:D
|: dA (3AAA defd | eB (3BBB efge | fa (3aaa afdf | gefd edBc | dA (3AAA defd | eB (3BBB efge | 
 fa (3aaa afec | dAfe d4 :: cA (3AAA cdec | dA (3AAA defd | eB (3BBB efge | fa (3aaa afec |1 
 dA (3AAA defd | eB (3BBB efge | fa (3aaa afec | dAfe d4 :|2 d3 c defd | e3 d efge | 
 fa (3aaa afec | d2 f2 d4 ||  