Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:6/8
K:D
['agf efg fed', 'G FED', 'fd dA', 'defg abaf']  
X:1
L:1/8
M:6/8
K:D
 agf efg | fed ABc | def gaf | e3 a2 b | agf efg | fed Adc | def edc | d3 :: D2 G | FED GAB | 
 AFD D2 G | FED def | e3 E2 G | FED GAB | AGF GAB | ABc dec | d3 :|[M:4/4][K:D] e | fd dA F>G AB | 
 =c/c/c cG EG eg | fd dA EG Bg | fa ef d/d/d d :: e | defg abaf | ge=cg ecge | defg abaf | 
 ge=ce d/d/d d :|  