Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:4/4
K:Bmin
['FBfe dB B2', 'df f2']  
X:1
L:1/8
M:4/4
K:Bmin
|: FBfe dB B2 | Aced cA A2 | FBfe dB B2 | cedc dBBA | FBfe dB B2 | Aced cA A2 | d2 (3efg fB B2 |1 
 cedc dBBA :|2 cedc dBBc |: df f2 df f2 | ceef gfef | df f2 df f2 | cedc dBBc | df f2 df f2 | 
 ceef gfef | d2 (3efg fB B2 |1 cedc dBBc :|2 cedc dBBA ||  