Generate a musical piece using the presented motif and follow the alphabetical structure provided.
X:1
L:1/8
Q:1/8=128
M:4/4
K:Bmin
['B<B d>e f2']  
X:1
L:1/8
Q:1/8=128
M:4/4
K:Bmin
|: B<B d>e f2 f>^g | a>f e>d c<A A>c | B<B d>e f2 f<b | f>e d>c B2- Bf | B<B d>e f2 f>^g | 
 a>f e>d c<A A>c | B<B d>e f2 f<b | f>e d>c B2- Bf | b<b f>d B>d f>^g | a<a e>c A>c e>a | 
 b<b f>d B>d f>b | f>e d>c B2- Bf | b<b f>d B>d f>^g | a<a e>c A>c e>a | b<b f>d B>d f>b | 
 f>e d>c B2- B2 :|  