Construct a music composition that complies with the designated structure and theme.
X:1
L:1/8
Q:1/2=100
M:4/4
K:G
['B2 A2', 'gdcB ABcd ecBA G2 BG A2'  
X:1
L:1/8
Q:1/2=100
M:4/4
K:G
 G2 Bd c2 B2 | A2 BG F2 D2 | G2 BG A2 cA | BdcB B2 A2 | G2 Bd c2 B2 | A2 BG F2 D2 | G2 BG A2 c2 | 
 BGAF G4 :: Bdef gdcB | ABcd ecBA | G2 BG A2 cA | BdcB B2 AB | cdef gdcB | ABcd ecBA | 
 G2 BG A2 c2 | BGAF G4 :|  