Compose a piece using the specified musical pattern based on the alphabet and the provided melodic theme.
X:1
L:1/8
M:2/4
K:G
['GB de/f/ gg f/e/d DF A>B', 'bd bd b>b b/a/g/b/ ad']  
X:1
L:1/8
M:2/4
K:G
|: GB de/f/ | gg f/e/d | DF A>B | cc c/B/A | GB de/f/ | gg f/e/d | DF A>B | AG G2 :: bd bd | 
 b>b b/a/g/b/ | ad ad | a>g a/g/f/a/ | bd bd | b>b b/a/g/b/ | ad ef | g2 g z :|  