Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:3/4
K:G
['D>D D2 FA']  
X:1
L:1/8
M:3/4
K:G
 GB d2 Bd | e>c e2 d2 | GB d2 B2 | ec A2 G2 | D>D D2 FA | Ac e2 d2 | D>D D2 FA | cA F2 G2 |]  