Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/4
Q:1/4=165
M:4/4
K:C
['[K:D]|: A d f e d a2', 'f/g/ a']  
X:1
L:1/4
Q:1/4=165
M:4/4
K:C
[K:D]|: A |"D" d f e d |"D" a2 f2 |"G" b a g f |"A" g"D" f2 :: a |"G" b g"A" e f/g/ | 
"D" a f d e/f/ |"G" g f e d |"A" e/d/ e/f/ e f/g/ |"D" a f/g/ a g/f/ |"A" g e/f/ g f/e/ | 
"D" f d"A" e3/2 d/ |"D" d3 :|  