Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
M:4/4
K:Bmin
['B2 d2', 'd2 fe']  
X:1
L:1/8
M:4/4
K:Bmin
|: B2 d2 cBBc | B2 c2 feef | B2 d2 cB B2 | cAAc fe e2 :: d2 fe dBAB | d2 a2 feef | d2 fe dB A2 | 
 A2 c2 feef :|  