Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:6/8
K:G
['DED DAB']  
X:1
L:1/8
M:6/8
K:G
|:"G" G3 GAB |"D" AGE"G" GED |"G" G3"Am" AGE |"D7" GED DEF |"G" G3 GAB |"Am" AGE GAB | 
"C" cBA"G" BGE |1"D" DED D3 :|2"D" DED DAB |:"C" c2 A"G/B" BAG |"Am" ABA"D7" AGE |"C" c2 A"G" BGE | 
"D7" DED DAB |"C" c2 A"G/B" BAG |"Am" ABA ABc |"D" dcA"C" GEA |1"D" DED DAB :|2"D" DED D3 |]  