Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
Q:3/8=90
M:6/8
K:D
['A2 D FED (F/G/)AD FED', 'edB d2 B AGF']  
X:1
L:1/8
Q:3/8=90
M:6/8
K:D
 B | A2 D FED | (F/G/)AD FED | GBG FAF | EFE EFG | A2 D FED | (F/G/)AD FED | B2 G A2 F | DED D2 :: 
 d/e/ | f2 d edB | d2 B AGF | EFE EGB | e3 efg | fed edB | d2 B AGF | AFA d2 F | DED D2 :|  