Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:4/4
K:Bmin
['Bffe f3 e dfef d2 B2 cded', 'BdcB A2 A2 ABcd']  
X:1
L:1/8
M:4/4
K:Bmin
 Bffe f3 e | dfef d2 B2 | cded cB A2 | BdcA BAFA | Bffe f3 e | dfef d2 B2 | cded cB A2 | 
 BdcA B3 A :| BdcB A2 A2 | ABcd cBBA | BdcB A2 A2 | ABcd B3 A | BdcB A2 A2 | ABcd cBBA | 
 BdcB A2 A2 | ABcd B3 A :|  