Craft a musical work based on the specified structure and given theme.
X:1
L:1/8
M:4/4
K:G
['G2 G>B', 'd>gB>g d>gB>g (b/a/g/f/) g>d e2'  
X:1
L:1/8
M:4/4
K:G
 G2 G>B d>BBd | B/c/d GB dBBg | G2 G>B dBBd | e/f/g d>B BAAB :| g>ag>d e2 eg | d>gB>g d>gB>g | 
 (b/a/g/f/) g>d e2 e>g | d<Bg>B B<AA>B | g>ag>d e2- e>g | d>gB>g d>gB>g | 
 (b/a/g/f/) g>d e2 (e/g/f/g/) | d<Bg>B B<A A>B ||  