Craft a composition that integrates the assigned alphabet-related musical pattern and the provided melodic theme.
X:1
L:1/8
Q:1/4=100
M:2/4
K:C
['CD EF G3 F A2 G2 GB', 'D4 G3 F E2 D2 |1 C3']  
X:1
L:1/8
Q:1/4=100
M:2/4
K:C
|: CD EF | G3 F | A2 G2 | GB AG | F3 D |1 E2 C2 :|2 E2 CC |: F2 D2- | D4 | G3 F | E2 D2 |1 C3 C :|2 
 C4- | C2 z2 ||  