Generate a musical piece using the presented motif and follow the alphabetical structure provided.
X:1
L:1/8
M:4/4
K:Bmin
['AB B2', 'f2 af']  
X:1
L:1/8
M:4/4
K:Bmin
|: B3 B dB B2 | FBBc dBAF | AB B2 ABde | faef edBA | AB B2 dB B2 | FBBc dBAF | AB B2 ABde | 
 faef edBA :: A2 ag fede | f2 af f2 af | fg g2 fede |1,3 faef edBA :|2,4 faef edBA :|  