Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/4
M:4/4
K:F
['A A']  
X:1
L:1/4
M:4/4
K:F
 F | F2 A2 | c2 z c | d c c B | A2 z A | A A A A | B2 A G | A G G F | G2 z G | D D E2 | F2 z F | 
 A A A A | F2 z F | B B B B | B2 A G | A A G F | G2 z G | D D E E | F2 F F | A A B G | F3 |]  