Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/4
Q:1/4=120
M:2/2
K:Ddor
['d e']  
X:1
L:1/4
Q:1/4=120
M:2/2
K:Ddor
 a | a f g a | f e/f/ d a | a f g a | f2 f a | a f g a | f e/f/ d a | a f g a | f2 d e | e c d e | 
 f e/f/ d e | e c d e | f2 d e | e c d e | f e/f/ d e | f c d e | f2 d |]  