Compose a piece using the specified musical pattern based on the alphabet and the provided melodic theme.
X:1
L:1/8
Q:1/4=160
M:2/4
K:G
['GA Bc d3 B c2 A2 FG', 'G2 c2 AB G3 E D2 EF']  
X:1
L:1/8
Q:1/4=160
M:2/4
K:G
|: GA Bc | d3 B | c2 A2 | FG AB | c3 A | B2 G2 :: c2 AB | G3 E | D2 EF | G2 z2 :|  