Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
M:6/8
K:G
['BAB cBc', 'def g2', 'bag fed cAF |1 AGF GBd :|2']  
X:1
L:1/8
M:6/8
K:G
 BAB cBc | ded cAG | F2 D DED | FED FGA | BAB cBc | dcA d2 e | fed cAF |1 AGF G2 A :|2 AGF GBd || 
 g3 def | g2 a bag | f3 dfg | afd cAG | g3 def | g2 a bag | fed cAF |1 AGF GBd :|2 AGF G2 A | 
"^Variations:" | BDD cDD | ded cAG | F3 DED | DGG FGA | BAB cBc | dcA d2 e | fed cAF ||1 
 AGF G2 A :|2 AGF GBd || g2 d def | g2 b a2 g | f2 d dfg | afd cAG | g2 d def | g2 a bag | 
 fed cAF |1 AGF GBd :|2 AGF G2 A ||  