Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:3/4
K:C
['EF Gg eG cE GF', 'GF DB A2']  
X:1
L:1/8
M:3/4
K:C
 EF |:"C" Gg eG cE |"G7" GF EB A2 | GF DB A2 |"C" GE Cc BA | Gg eG cE |"G7" GF DB A2 | Gf BD GB |1 
"C" c2 z2 EF :|2"C" c2 z2 z2 |]  