Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/4
M:4/4
K:G
['G G']  
X:1
L:1/4
M:4/4
K:G
"G" G G G G | G3/2 G/ D2 | G2 F G |"D7" A4 |"D7" F F F F | F3/2 F/ D2 |"G" B2"D7" B A |"G" G4 |]  