Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/16
M:3/4
K:F
['f2ef g2eg', 'F4 c4 cBAG F2_E2 DBAB cBAB fBAB']  
X:1
L:1/16
M:3/4
K:F
 f2ef g2eg f2c2 | BAGF EGBd c4 | f2ef g2eg b2g2 | agfe f4 F4 :: c4 cBAG F2_E2 | DBAB cBAB fBAB | 
 d4 dc=BA G2F2 | Ec=Bc dcBc gcBc | Ta2ga b2a2 g2f2 | (bgfe) f4 F4 :|  