Compose a piece of music based on the provided motif and adhering to the outlined musical structure.
X:1
L:1/4
M:6/4
K:Bb
['c d', 'f g'  
X:1
L:1/4
M:6/4
K:Bb
 F | B c d e d c | d c B f2 d | e f g f g d | c3 c2 A | B c d e d c | d c B b2 a | g a f =e f g | 
 g3 f2 |] f | f g a b2 a | g f e d2 b | a b g ^f g a | a3 g3 | f g a b f g | f g d c2 d | 
 B B f f d g | c3 B2 |]  