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
['Bdfb bfdB ceGc BAGF', 'fdBf geBg']  
X:1
L:1/8
M:4/4
K:Bb
|: Bdfb bfdB | ceGc BAGF | EGce DFdB | ecGc BAGF | Bdfb bfdB | ceGc BAGF | DFBd Ggec | 
 dfFA B2 B2 :: fdBf geBg | fdBd cA F2 | fdBf geBg | ecBA B2 B2 | DBFB EcGc | FAce dfBA | 
 GEDE CEGc | ecBA B2 B2 :|  