Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:6/8
K:G
['B2 A BGD GAG GBd ege dBG', 'g2 g']  
X:1
L:1/8
M:6/8
K:G
 dc | B2 A BGD | GAG GBd | ege dBG | ABA AGA | B2 A BGD | GAG GBd | ege dBG | AGF G :: Bd | 
 g2 g efg | eag fed | g2 g edB | BAG ABc | B2 A BGD | GAG GBd | ege dBG | AGF G :|  