Compose a piece of music following the given alphabetical representation of the musical structure and the provided motif.
X:1
L:1/4
M:4/4
K:F
['A B']  
X:1
L:1/4
M:4/4
K:F
 c | c d c B | B G F2 | z F A B | c G A B | c2 z A | B c d c | B A B2 | z A G A | B c c =B | c3 |]  