Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/16
M:2/4
K:D
['a2ag f2ef g2f2 e4', 'Adfd Acec']  
X:1
L:1/16
M:2/4
K:D
|: a2ag f2ef | g2f2 e4 | f2d2 dcdf | edcB A2fg | a2ag f2ef | g2f2 e4 | f2a2 gfec | d4 d4 :: 
 Adfd Acec | Adfd Acec | d2a2 g2f2 | edef e2e2 | Adfd Acec | Adfd Acec | d2a2 gfec | d4 d4 :|  