Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:Emin
['GEED E2', 'dBAG F2 GA BedB AcBA GEED E2']  
X:1
L:1/8
M:4/4
K:Emin
|: EB B2 B^cdB | AGFE D2 D>E | F/E/DFA GFEF | GEED E2 E2 | EB B2 B^cdB | AGFE D2 D>E | 
 F/E/DFA GFEF |1 GEED E2 E2 :|2 GEED E2 EF |: G2 GB A2 GA | BedB A2 GA | Beef g/f/efa | 
 gedf e2 ef |1 g2 ge f2 fe | dBAG F2 GA | BedB AcBA | GEED E2 EF :|2 gafg edBe | dBAG F2 GA | 
 BedB AcBA | GEED E2 E2 ||  