Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:6/8
K:Emix
['', 'dcd Bec', 'c d2 A dfd dAF']  
X:1
L:1/8
M:6/8
K:Emix
 F |: GFE dcd | Bec d2 B | AFA DdA | BAF EGA | BEE dcd | Bec dcd | edB AFB |1 EFE E2 B :|2 
 EFE EGB || e2 B ege | e^dB B2 c | d2 A dfd | dAF EGB | e2 B ege | e^dB Bgf | e^dB AFA | EFE EGB | 
 e2 B ege | e^dB B2 c | d2 A dfd | dAF EGA | BEE dcd | Bec dcd | edB AFB | EFE E2 B ||  