Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:6/8
K:F
['FGF cdc fed', 'C3 cdc agf _edc TB>AB BcB gf=e']  
X:1
L:1/8
M:6/8
K:F
 FGF cdc | fed c3 | dcB cBA | FGF GEC | FGF cdc | fed agf | edc Gc=B | c3 C3 :: cdc agf | 
 _edc TB>AB | BcB gf=e | dcB Aff | dBf dBf | cAf cAf | AcF GBE | F3 f3 :|  