Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:C
['EG AcAG E2']  
X:1
L:1/8
M:4/4
K:C
 EG | AcAG E2 DC | D>CDE A2 EG | AcAG E2 DC | D>CDE c3 d | edcA G2 ed | cA GE D2 EG | AcAG E2 cd | 
 e3 E E2 ||  