Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:4/4
K:Bb
['z2 FF']  
X:1
L:1/8
M:4/4
K:Bb
 FF | B2 B2 F2 F2 | D2 FD B,2 BB | A2 B2 c2 d2 | cf=ed c2 BB | A3 A c2 c2 | F4 z2 FF | e3 c d3 B | 
 dc c2 z2 FF | e3 f d3 B | dc c2 z2 FF | B2 B2 c2 c2 | f3 d B2 BA | Gedc d2 c2 | B6 |]  