Craft a composition that integrates the assigned alphabet-related musical pattern and the provided melodic theme.
X:1
L:1/8
M:6/8
K:C
['F2 E D2 G']  
X:1
L:1/8
M:6/8
K:C
 G | A2 G A2 B | c2 G G2 E/E/ | F2 E D2 G | C3 C2 G | c2 c d2 d | e2 e e2 e | d2 c c2 B | c3 c2 G | 
 F2 E D2 G | C3 c2 E | F2 E D2 G | (C3 C3) ||  