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
['g2 e2']  
X:1
L:1/8
M:3/4
K:C
 df g2 e2 | fd g2 e2 | df g2 e2 | fd B2 c2 | de c2 G2 | fd B2 G2 | de c2 G2 | AG B2 c2 | decB G2 | 
 ff e2 ce | decB G2 | AG B2 c2 |]  