Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
M:6/8
K:C
['FGA AFD BAG AFD', 'B3 cBc ded']  
X:1
L:1/8
M:6/8
K:C
[K:G] G | FGA AFD | BAG AFD | ABA ABG | ABA ABG | FGA AFD | BAG AFD | D>GG GAF | D>GG G2 :: A | 
 B3 cBc | ded cAG | ABA ABG | ABA ABG | B3 cBc | ded cAF | D>GG GAF | D>GG G2 :|  