Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:6/8
K:G
['G |:S', 'AGF G>AB cde d>ed dcB', 'AGF (G3 A3) d>cB AGF']  
X:1
L:1/8
M:6/8
K:G
 G |:S d>cB AGF | G>AB cde | d>ed dcB | (B3 A2) d | d>cB AGF | G>AB cde | d>ed dcB | (A3 G3) :: 
 d>cB AGF | (G3 A3) | d>cB AGF | (G3 A3) | d>cB AGF | G>AB cde | d>ed dcB | (A3 G3) :|  