Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
Q:1/4=30
M:2/4
K:Bmin
['BcdB F2', 'B2 c2 dddd eeef ddcd ecAc dddd']  
X:1
L:1/8
Q:1/4=30
M:2/4
K:Bmin
 F | BcdB | F2 F^G | AB cd | e2 dc | BcdB | F2 F g | fedc | B2 B2 :: c2 | dddd | eeef | ddcd | 
 ecAc | dddd | eeeg | fedc | B2 B2 |]  