Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:2/4
K:A
['B2 FA B4']  
X:1
L:1/8
M:2/4
K:A
 B2 FA | B4 | e>fec | B>ecB | A2 EF | A4 | B>cBA | B F2 E | F4 | B2 CE | F4 | A>BAF | EAFE | 
 D2 A,B, | D4 | E>FED | E B,2 A, | B,4 | B2 FA | B4 | faec | B4 | faec | BeBA | FAEF | A4 | BcBA | 
 B F2 E | F4 |]  