Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:6/8
K:Bmin
['', 'B2 c dcB efg', 'B3 B2']  
X:1
L:1/8
M:6/8
K:Bmin
 F |: B2 c dcB | efg f2 d | B2 f fed | cAc edc | B2 c dcB | efg f3 | fed cAc |1 B3 B2 F :|2 
 B3 B2 f |: fdB fdB | g3 g2 f | ecA ecA | f3 f2 e | dBG dBG | efg f3 | dcB AFA |1 B3 B2 f :|2 
 B3 B2 F ||  