Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
Q:1/2=90
M:4/4
K:G
['G2 d>B', 'd2 g>f e>dc>B']  
X:1
L:1/8
Q:1/2=90
M:4/4
K:G
 G2 d>B | G2 d>B | c>dc>B | A>G F2 | G2 d>B | G2 d>B | c>AG>F | G2 z2 :: d2 g>f | e>dc>B | 
"_NB" A>Bc>d | B2 G2 | d2 g>f | e>dc>B | A>cF>A | G2 z2 :|  