Construct a music composition that complies with the designated structure and theme.
X:1
L:1/8
M:4/4
K:G
['B2 B2', 'g3 f d3 (3d/e/f/'  
X:1
L:1/8
M:4/4
K:G
 B2 B2 B3 A/B/ | c3 =F G2 ED | B2 B2 B2 A>G | G3 D G>D G/D/G/A/ | B2 B2 B3 A/B/ | c3 =F G2 ED | 
 B2 B2 B2 A>G | G3 F G4 || g3 f d3 (3d/e/f/ | g>f ga b2 ag | =f3 e c3 (3A/_B/c/ | 
 =f f/e/ f f/e/ =fe cf | g3 f d3 (3d/e/f/ | g2 g/ b/(3a/g/f/ g g/f/ dB | c2 B>G A2 A/ d/c/A/ | 
 B<d G>F G4 ||  