Compose a piece using the specified musical pattern based on the alphabet and the provided melodic theme.
X:1
L:1/8
M:4/4
K:G
['GFGA BGBd cBce d2 Bd', 'GABd gdBd edgd c2 Bd']  
X:1
L:1/8
M:4/4
K:G
|: D2 | GFGA BGBd | cBce d2 Bd | gdcB cedc | BGAF DEFD | GFGA BGBd | cBce d2 Bd | gdBd cAFA | 
 G2 GF G2 :: D2 | GABd gdBd | edgd c2 Bd | gdcB cedc | BGAF DEFD | GABd gdBd | edgd c2 Bd | 
 gdBd cAFA | G2 GF G2 :|  