Develop a musical composition in line with the given structure and theme.
X:1
L:1/4
M:3/4
K:G
['e _e']  
X:1
L:1/4
M:3/4
K:G
 B | e e f | e2 e/f/ | g f e | _e B B | e e f | e2 e/f/ | g a g | f2 f | g f g | a g a | b g e | 
 _e B b/a/ | g e e | _e B A | B e _e | e2 :|  