Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:Edor
['BE E2 EFGA Beed efge fd d2', 'd Beed efge fd d2 Adaf g2']  
X:1
L:1/8
M:4/4
K:Edor
 BE E2 EFGA | Beed efge | fd d2 eB B2 | dBAd BAFA | BE E2 EFGA | Beed efge | fd d2 Adaf | 
 geed e e2 d :: Beed efge | fd d2 Adaf | g2 bg fgaf | geed e e2 d | Beed efge | fd d2 Adaf | 
 g2 bg fgaf | geed e e2 d :|  