Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:6/8
K:Bmin
['F B(d/c/).B/.^A/', 'B2 d (A/B/)dd d2 d (d/c/)(d/e/)(f/g/) (af).d']  
X:1
L:1/8
M:6/8
K:Bmin
 F | B(d/c/).B/.^A/ BFF | d(e/d/).c/.B/ dFF | B(d/c/).B/.^A/ BFd | EF^A B2 F | B(d/c/).B/.^A/ dFF | 
 d(e/d/).c/.B/ dFF | G(A/G/).E/.D/ F(G/F/).E/.D/ | EF^A B2 :: d | (A/B/)dd d2 d | 
 (d/c/)(d/e/)(f/g/) (af).d | g(a/g/).f/.e/ fdB | AFA B2 d | (A/B/)dd d2 d | 
 (d/c/)(d/e/)(f/g/) (af).d | b(a/g/).f/.e/ f(e/d/).c/.B/ | AF^A B2 :|  