Construct a music composition that complies with the designated structure and theme.
X:1
L:1/8
M:4/4
K:G
['', 'GA BABG', 'BABd efge'  
X:1
L:1/8
M:4/4
K:G
 GA |: BABG E2 FG | ABAF D2 GA | BABG EFGE | D2 G2 G2 GA | BABG E2 FG | ABAF D2 GA | 
 BABG EF (3GFE |1 D2 G2 G3 A :|2 D2 G2 G4 || BABd efge | dcBA G2 GA | BABd efge | f2 d2 d4 | 
 BABd efge | dcBA G2 GA | BABG EF (3GFE | D2 G2 G4 ||  