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
['EFGA BABc dD(3DDD', 'E2 efge fgaf efge fedf eB(3BBB BAGF']  
X:1
L:1/8
M:4/4
K:Edor
|: EFGA BABc | dD(3DDD dFAF | EFGA BAGF | EBAF GEED | EFGA BABc | dD(3DDD D2 AF | EFGA BAGF | 
 E2 BE GE E2 :: efge fgaf | efge fedf | eB(3BBB BAGF | EBAF GE E2 | efge fgaf | efge fedf | 
 eB(3BBB BAGF | EBAF GE E2 :|  