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
['G2 c cBc', 'g2 e']  
X:1
L:1/8
M:6/8
K:C
|: G2 c cBc | G2 c cBc | A2 d dcd | Bag fdB | G2 c cBc | G2 c cBc | Bag fed | c3- c2 :| 
 !fermata!g2 e g2 e | g2 e ceg | a2 f a2 f | a2 f def | g2 e g2 e | g e2 cde | ded cBA | 
 G^FG BAG |]  