Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:6/8
K:G
['A3 cBA ece aec', 'aga fga', 'A2 GDG B^AB GB/c/d gdB G2 D', 'gfg efg']  
X:1
L:1/8
M:6/8
K:G
|: E | A3 cBA | ece aec | A3 cEE | E^DE =dcB | A3 cBA | ece aec | fga ecA | dcB A2 :: a | aga fga | 
 g/a/ba gfe | aga fga | bag a2 g | agf edc | fed cBA | aga edc | dcB A2 :| GDG B^AB | GB/c/d gdB | 
 G2 D BdG | DED cc/B/A | G3 BAG | dBd g2 d | efg dBG | cBA G2 :| gfg efg | fag fed | gfg efg | 
 agf g2 f | gfe d>cB | edc B>AG | gg/g/g dBG | cBA G2 :|  