Develop a musical composition in line with the given structure and theme.
X:1
L:1/4
Q:1/2=80
M:2/2
K:D
['f d', 'A a/b/ a g/f/ e/f/g/a/ b g'  
X:1
L:1/4
Q:1/2=80
M:2/2
K:D
 a/g/ | f d e/d/c/B/ | A2 A a/g/ | f d d e | f d d f | g g/a/ b/a/g/f/ | e a a b | ^g e a g | 
 a A A :: a/b/ | a g/f/ e/f/g/a/ | b g g a | d d B e | c A A f | B/c/ d c/d/ e | e/f/ g f/g/ a | 
 b/a/g/f/ e/f/g/a/ | f d- d :|  