Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/4
M:3/4
K:G
['d d']  
X:1
L:1/4
M:3/4
K:G
 d d B | d d c | B/d/g/f/ e | d2 B | A/A/ c A | G/B/ d g | e/c/ A A/F/ | G2 G |]  