Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
M:4/4
K:G
['dG G2', 'dg g2']  
X:1
L:1/8
M:4/4
K:G
|: Bc | dG G2 dgfg | d2 de dcAB | cF F2 dF F2 | (3Bcd de dcBc | dG G2 d3 e | d3 e dcAG | 
 FGAB cdeg | fdcA G2 Bc :: dg g2 ag g2 | dg g2 b3 g | d3 e f3 e | defg agfd | dg g2 ag g2 | 
 dg g2 b3 g | dcde f3 d | cAFA G4 :|  