Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:4/4
K:Edor
['ADFD FA A2 Bcdf edBc', 'B2 eB fBeB']  
X:1
L:1/8
M:4/4
K:Edor
 Bcdf e2 dB | ADFD FA A2 | Bcdf edBc | dBA=c BDFA | B2 BA BcdB | ADFD FA A2 | Bcdf edBc | 
 dBA=c BDFA || B2 eB fBeB | defa afed | B2 eB fBeB | dBA=c BDFA | (3Bcd eg fdeB | defa af e2 | 
 fbba fafe | dBA=c BDFA ||  