Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:6/8
K:G
['G2 G AGA', 'G2 d gfg efg fdd def gfg']  
X:1
L:1/8
M:6/8
K:G
|: D | G2 G AGA | Bdd efg | G2 G AGA | BGE EDE | G2 G AGA | Bdd efg | edB AGA | BGF G2 :: d | 
 gfg efg | fdd def | gfg aga | bge e2 f | gag efg | agf efg | edB AGA | BGF G2 :|  