Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/4
M:2/2
K:G
['f/d/ A/c/', 'e/g/ f/a/ a/g/ f e/a/ a/g/ f/a/', 'A c', 'a g f']  
X:1
L:1/4
M:2/2
K:G
 f/d/ A/c/ d f/d/ | A/c/ e/g/ f/d/ A/c/ | d e/c/ A/c/ e/g/ :: f/a/ a/g/ f e/a/ | 
 a/g/ f/a/ b/a/ g/f/ | e e/c/ A/c/ e/g/ :|[M:3/2] f d A c d2 | f d A c e g | f d A c d2 | 
 e c A c e g :: f a a g f2 | e a a g f a | b a g f e2 | e c A c e g :|  