Craft a composition that integrates the assigned alphabet-related musical pattern and the provided melodic theme.
X:1
L:1/8
M:2/2
K:G
['(3DEF GABd g2 gf edcB A2 AF', 'Bc dBGA BGBc dBGB A2']  
X:1
L:1/8
M:2/2
K:G
 (3DEF | GABd g2 gf | edcB A2 AF | DEFG ABAF | GABG A2 Bc | dBGA B2 B2 | edcB ABAF | 
 FAAB c2 !plus!e2 | dcBA G2 :: Bc | dBGA BGBc | dBGB A2 AB | cAFA DFAB | GABG A2 Bc | dBGA BGBc | 
 dBGB A2 A2 | FAAB c2 !plus!e2 | dcBA G2 :|  