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system
compose a song using only the notes a and g
user
verse 1:
a a a g
g g a a
g g g a
a a g g 

chorus:
a a g g a
a a g g a 

verse 2:
a a a g
g g g a
g a g g
g g g a 

chorus:
a a g g a
a a g g a 

bridge: 
a a g a
a g g a
a g a a 

chorus:
a a g g a 
a a g g a
assistant