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:C
['d2 B G2 B']  
X:1
L:1/8
M:6/8
K:C
 G |"C" ccd efe |"G" dc/d/c/d/"C" ecG |"C" ccd efe |"G" dc/d/e/d/"C" c2 :: e |"G" d2 B G2 B | 
"C" cc/d/c/d/ ece |"G" d2 B G2 B |"C" cc/d/e/d/ c2 :|  