Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/4
M:4/4
K:C
['A3/2 B/ A F A B d3/2', 'f a']  
X:1
L:1/4
M:4/4
K:C
[M:4/4][K:D] f/ ve/e/ G/[Q:1/8=120].B/ | A3/2 B/ A F | A B d3/2 e/ | f a e f | d B B/c/d/B/ | 
 A3/2 B/ A F | A B d3/2 e/ | f a e f | d2 d3/2 :| e/ | f a a3/2 f/ | g b b g | f a e f | d B B d | 
 f a a3/2 f/ | g b b3/2 c'/ | d' c' c' a | b2 b3/2 a/ | f a a f | g b b g | f a e f | 
 d B B/c/d/B/ | A3/2 B/ A F | A B d3/2 e/ | f a e f | d2 d3/2 :|  