Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
Q:1/4=90
M:4/4
K:G
['G2 B2']  
X:1
L:1/8
Q:1/4=90
M:4/4
K:G
 D3 D G2 B2 | d2 (ed) d2 B2 | B2 (cB) B A E2 | D2 (BA) G4 | G2 B2 (ed) (cA) | G3 B (ed) A2 | 
 B2 (AG) E2 (GA) | D2 (BA) G4 |]  