Generate a musical piece using the presented motif and follow the alphabetical structure provided.
X:1
L:1/4
Q:1/2=100
M:4/4
K:D
['d a f f', 'd2 c3/2 d/ e f g f']  
X:1
L:1/4
Q:1/2=100
M:4/4
K:D
 d a f f | e/f/e/d/ c A | d a f f | a g/f/ e2 | d a f f | e/f/e/d/ c A | d (c/B/) g (f/e/) | 
 c2 d2 :: c3/2 d/ e f | g f e (d/c/) | d B g a | f2 e2 | a/b/a/g/ f f | d d B3/2 f/ | 
 g (f/e/) (d/c/)(d/e/) | e2 d2 :|  