Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:4/4
K:D
['fd e2 fd', "ad' b2 ad g2"]  
X:1
L:1/8
M:4/4
K:D
|: fd e2 fd e2 | fd cd e/d/c/B/ A2 | fd e2 fd e2 | fd Be Ac d2 :: ad' b2 ad g2 | 
 fd cd e/d/e/f/ e2 | ad' b2 ad g2 | fB ge dc d2 :|  