Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
Q:1/4=160
M:4/4
K:G
['G2 GA B2 GD', 'G2 GA B2 Bd gdcB c2 ce']  
X:1
L:1/8
Q:1/4=160
M:4/4
K:G
|: D2 | G2 GA B2 GD | E2 EG c2 cA | E2 EF G2 B2 | AGFE DCB,A, | G2 GA B2 GD | EEEG c2 c2 | 
 BdBG FGAF | G2 GG G2 :: GA | B2 Bd gdcB | c2 ce agfe | fdfa gfed | edce A2 GA | BAGA Bcde | 
 fede fg a2 | BdBG cAFA | AGGF G2 :|  