Construct a musical composition utilizing the provided motif and conforming to the specified structure.
X:1
L:1/8
M:4/4
K:Bmin
['fB B2 Bcde fece a3', '(3Bcd cd BF F2 DF F2'  
X:1
L:1/8
M:4/4
K:Bmin
|: fB B2 Bcde | fece a3 e | faed cA A2 | cAce a2 ba | fB B2 Bcde | fece a3 f | g3 e f3 e | 
 dcBA FB B2 :: (3Bcd cd BF F2 | DF F2 Bc d2 | ecBc AE E2 | cE E2 ABcA | (3Bcd cd BF F2 | 
 DF F2 Bcdf | ecBc fcec | dcBA FB B2 :|  