Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:2/2
K:Bb
['B,2 (3dcB (3AGF g4 f>e d>fB>d c>eA>c', 'B,>DF>B d>fb>a (g>^f)g>a g2']  
X:1
L:1/8
M:2/2
K:Bb
|: (ud>c) | B2 B,2 (3dcB (3AGF | E2"_>" g4 f>e | d>fB>d c>eA>c | B>(ba>)(g f>)(ed>)(c | 
 B2) B,2 (3dcB (3AGF | E2"_>" g4 f>e | d>fB>d c>eA>c | B2 b2 B2 :: (uF>D) | B,>DF>B d>fb>a | 
 (g>^f)g>a g2 C>B, | A,>CF>A c>fa>g | (f>=e)f>g f2 F>D | B,>DF>B d>fb>a | (g>^f)g>a g2 d>e | 
 (g>f)d>B (f>e)c>A | B2 b2 [BD]2 :|  