Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:3/4
K:F
['c3 A']  
X:1
L:1/8
M:3/4
K:F
 F | FA c3 A | A>G G3 G | Gd c3 B | B2 A2 z F | FA c3 A | A>G G3 G | Gd c3 B | B2 A2 z c | 
 c>cfcAF | c>c c3 c | c>cfcAF | c>c c3 c | c3 A d3 c | c2 B2 z3 B | B3 G c3 E | G2 F2 z3 |]  