Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:6/8
K:Bmin
['dcB BAF', 'B2 dfa dfa df/g/a fed cAe ceA', 'dcB BAF B2 B', 'dBB B2']  
X:1
L:1/8
M:6/8
K:Bmin
 dcB BAF | B^AB B/c/dB | cBA ceA | cea ecA | dcB BAF | B2 B dfa | f/g/af edc | dB^A B2 :| dfa dfa | 
 df/g/a fed | cAe ceA | cea ecA | dcB BAF | B2 B dfa | faf edc | dB^A B2 :: dcB BAF | B2 B Bcd | 
 cBA ceA | cea cBA | dcB BAF | B2 B dfa | faf edc |1 dBB B2 F :|2 dBB B2 d |: dfa dfa | dfa fed | 
 ceA ceA | cea cBA | dcB BAF | B2 B dfa | faf edc |1 dBB B2 d :|2 dBB B2 F ||  