Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/4
M:4/4
K:G
['A B', '^c d F G F E2 F/G/A/F/']  
X:1
L:1/4
M:4/4
K:G
 A | B A B G | E3/2 E/ E/ E (F/G/) | A F D F | A B (B3/2 ^c/) | d B d e | d (B/^c/) d2 | 
[M:2/4] c3/2 d/ | B F E D | B ^c || d F | G F E2 | F/G/A/F/ D2 | G A/ B c/ | B/G/ F/ G/ E ||  