Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
Q:1/2=80
M:2/2
K:G
['GABc d2 g2', 'D2 dedB cdcA BdBG AFED G>DEF G2']  
X:1
L:1/8
Q:1/2=80
M:2/2
K:G
 GABc d2 g2 | fafd ecBA | GABc d2 g2 | faf^c d2 D2 :: dedB cdcA | BdBG AFED | G>DEF G2 c2 | 
 BdAF G2 [G,G]2 :|  