Assemble a piece of music by merging the alphabetic representation of the predetermined musical pattern and the provided melodic theme.
X:1
L:1/8
M:6/8
K:Bmin
['', 'BAF FEF DFA', 'A def a2 b afb afe def']  
X:1
L:1/8
M:6/8
K:Bmin
 FA |: BdB BAF | FEF DFA | B/c/dB BAF | d2 e fed | B3 BAF | FEF DFA | def geg | fdB B2 A :: 
 def a2 b | afb afe | def geg | fdB B2 A | def a2 b | afb afe | def geg | fdB B2 A :|  