Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
Q:1/4=100
M:2/4
K:F
['ae/f/ gf ed d^c/d/', 'Ge c/B/c/e/ ag g/^f/g', 'f2 e>d dc']  
X:1
L:1/8
Q:1/4=100
M:2/4
K:F
 ae/f/ gf | ed d^c/d/ | bc/e/ ag | gf f/e/f/g/ | ae/f/ gf | ed d^c/d/ | bd c/e/g/a/ | fff z :: 
 Ge c/B/c/e/ | ag g/^f/g | f^c e>d | dB d/c/B/A/ | Ge c/B/c/e/ | ag g/^f/g | aGe>d | cc c2 :: 
 f2 e>d | dc c2 | c/d/^d/e/ ag | f/g/^g/a/ ba | f2 e>d | dc A2 | c/d/e/f/ a>g | ff f2 :|  