Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:4/4
K:Bb
['F B2 (dB) ecdB FB (G/F/E/D/) (EC)Cd', 'fBdB (FB/c/ d).B']  
X:1
L:1/8
M:4/4
K:Bb
 F | B2 (dB) ecdB | FB (G/F/E/D/) (EC)Cd | BFGe dgec | BFGE D(B,B,) :| g | fBdB (FB/c/ d).B | 
 ecdB A(cce) | dFBg fdcB | AcFA Bdeg | fBdB (FB/c/ d).B | df (e/d/c/B/) (Ac)ec | BFGb gefF | 
 GBTFE D(B,B,) ||  