Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:6/8
K:Bmin
['B2 c', 'B2 c'  
X:1
L:1/8
M:6/8
K:Bmin
 f2 B B2 c | d2 e c/B/ A2 | f2 B B2 c | c<ef A<(BB) | f2 B B2 c | d2 e c/B/ A2 | B2 c f2 c | 
 e/(A/ A2) A<(BB) :: B2 c c<de | f/(a/ a2) e/(f/ f2) | f>Bd f>Bd | e2 c B3 | B2 c d>ef | 
 e2 d B<(cc) | f2 B B<AA/<B/ | d>ec A<(BB) :|  