Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/4
M:3/2
K:D
['', 'A B c d2']  
X:1
L:1/4
M:3/2
K:D
 D2 |] F B A2 (G3/2 E/) | D D D3 A | B c d2 c3/2 B/ | A c B3 A | B c d2 (c3/2 B/) | A A B3 D | 
 F (B/A/) F F D A, | D D D2 |]  