Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/4
M:3/4
K:G
['A B', 'd B']  
X:1
L:1/4
M:3/4
K:G
 D | G2 A | B G G | g f e | d2 B | D G A | B d G | A c B | A F D | G2 A | B G G | g f e | d2 B | 
 D G A | B d c | B2 A | G2 d || e d d | B G G | A c B | c2 d | f e e | c2 A | B d c | d2 f/g/ | 
 a g g | d B d | f (3f/f/f/ f | c2 d | d c d | e d B | G (3G/G/G/ G | G3 ||  