Develop a musical composition based on the provided pattern of letters and incorporating the given motif within it.
X:1
L:1/8
M:4/4
K:Bmin
['fB B2 Bcde fece a3', 'Bdcd BF F2 DF F2 Bcdf']  
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 :: Bdcd BF F2 | DF F2 Bcdf | ecBc AE E2 | CE E2 defe | Bdcd BF F2 | DF F2 Bcdf | 
 d2 cd fdec | dcBA FB B2 :|  