Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:4/4
K:D
['DDDD DFAF', 'AdFd E2']  
X:1
L:1/8
M:4/4
K:D
 DDDD DFAF | E2 FD B,2 A,B, | DDDD DFAF |1 B2 BA BABd :|2 B2 dc BABc |: dcde dAAd | Bcdc B2 AG | 
 FABc dcBd |1 AdFd E2 D2 :|2 AdFd E2 DB, | D2 ||  