Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:2/2
K:G
['D2 B,D']  
X:1
L:1/8
M:2/2
K:G
|:"G" GBdB"C" ec"G"dB |"G" GBdB"D7" AFAF |"G" GBdB"C" ec"G"dB |"Am" Ac"D7"AF"G" G2 G2 :: 
"G" D2 B,D DB,DB, |"G" D2 B,D G2 B2 |"G" D2 B,D DB,DB, |"Am" Ac"D7"AF"G" G2 G2 :|  