Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
M:2/2
K:G
['dGBG FAAc', 'g2 fg afed']  
X:1
L:1/8
M:2/2
K:G
 g | dGBG FAAc | BGBd g2 fe | dGBG FAAc | BGAF G2 G :| f | g2 fg afed | ggfg a2 df | g2 fg afed | 
 egfa g2 gd | g2 fg afed | ggfg a2 df | g2 fg afed | egfa gbeg ||  