Craft a musical work based on the specified structure and given theme.
X:1
L:1/8
M:4/4
K:Bmin
['B3 f fece fa a2', 'f3 b'  
X:1
L:1/8
M:4/4
K:Bmin
|: f2 ec B3 f | fece fa a2 | faec B3 d | ceBB ABce | faec B3 f | fece fa a2 | gf (3efg fede | 
 edcd B2 de :: f3 b bafa | a2 bc' bafe | f3 b bafg | gfed e2 de | f3 b bafa | a2 bc' bafa | 
 gf (3efg fede | edcd Bcde :|  