Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/4
M:4/4
K:D
['g f']  
X:1
L:1/4
M:4/4
K:D
"D" f2 f e/f/ |"G" g f e d |"A7" c d e f |"D" d A F A |"D" f2 f e/f/ |"G" g f e d |"A7" c d e f | 
"D" d2 d2 ::"D" a2 a g/a/ | b a g f |"A7" g2 g f/g/ | a g f e |"Bm" f2 f e/f/ |"G" g f e d | 
"A7" c d e f |"D" d2 d2 :|  