Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:3/4
K:Bb
['B2 B']  
X:1
L:1/8
M:3/4
K:Bb
 F | B2 B B | B2 B | c B G | B2 | B | B G E | E D E | E2 F/ D/ | C2 | D | F B e d | c B =A | B2 x |]  