Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
Q:1/4=120
M:2/4
K:C
['g>f ec', 'e>f ed ec A2 d>B']  
X:1
L:1/8
Q:1/4=120
M:2/4
K:C
 g>f ec | d>f ed | g>f ec | d2 d2 :| e>f ed | ec A2 | d>B cA | d>B cA | e>f ed | ec A2 | d>B cd | 
 ed c2 :|  