Compose a piece using the specified musical pattern based on the alphabet and the provided melodic theme.
X:1
L:1/8
M:2/4
K:G
['B2 g2 f2 a2 e2', 'gfed ee e2 fedB e2', 'fedB A2 AB G2 GG A2 e2']  
X:1
L:1/8
M:2/4
K:G
 B2 g2 | f2 a2 | e2 g2 | gfed :: ee e2 | fedB | e2 e2 | fedB :: A2 AB | G2 GG | A2 e2 | ed B2 :|  