Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
M:6/8
K:Bmin
['BBB d2 e fed', 'afd afd']  
X:1
L:1/8
M:6/8
K:Bmin
|: BBB d2 e | fed c2 B | AAA c2 A | cef ecA | BBB d2 e | fed cde | fBB ecA | BBB f2 f :: dfa afd | 
 afd afd | cde ede | cde ecA | dfa afd | afd afd | d2 f ecA | BBB f2 f :|  