Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
M:6/8
K:G
['G/A/ BcB BGB e2 f g2 e', 'g2 e']  
X:1
L:1/8
M:6/8
K:G
 G/A/ | BcB BGB | e2 f g2 e | BcB BAG | A3 A2 G/A/ | BcB BGB | e2 f g2 e | fdB Bcd | e3 e2 :: 
 e/f/ | g2 g f2 a | g2 e ede | fdB BAG | A3 A2 G/A/ | B>cB B>GB | e2 f g2 e | fdB Bcd | e3 e2 :|  