Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
Q:1/4=75
M:6/8
K:G
['D/D/D<G E/F/G<A GB/GB/']  
X:1
L:1/8
Q:1/4=75
M:6/8
K:G
|: D/D/D<G E/F/G<A | GB/GB/ AF/ED/ | D/D/D<G E/F/G<A | GB/GB/ AF<G :|  