Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:2/4
K:G
['G2 G>A B>A B/c/d', 'Bd de/f/']  
X:1
L:1/8
M:2/4
K:G
 D | G2 G>A | B>A B/c/d | GB dB | AG ED | G2 G>A | B>A B/c/d | e/f/g fg | AG G :: A | Bd de/f/ | 
 g>f ed | Bd de/f/ | gB A2 | Bd de/f/ | g>f ed | B/c/d Bd | BG G :|  