Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:4/4
K:A
['', '(3AcA EA ceae fdBF DFBd', "ec'ae' fd'ec' dbca B^dfb e2 de fedB", 'c2 aece g^ece f^efg f=edc Bgfg eB']  
X:1
L:1/8
M:4/4
K:A
 E2 |: (3AcA EA ceae | fdBF DFBd | gfdB fecA | (3AcA (3AGF E2 (3FFG | (3AcA EA ceae | 
{g} fdBF DFBd |1 gfdB AB^df | e^def (3efe (3=dcB :|2 gfdB GEFG | Aaec A2 ^de || fedB GEFG | 
 Aeca ec'ae' | fd'ec' dbca | B^dfb e2 de | fedB GEFG | Ae e2 aece | fd'bg ec'af | 
 (3efe (3dcB A2 c2 || caga fc c2 | f^efg ac c2 | aece g^ece | f^efg f=edc | Bgfg eB B2 | 
 e^def gB B2 | (3gfe Bg (3f^dB AF | (3EGB (3egb e'2 E2 ||  