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
['d B']  
X:1
L:1/4
M:4/4
K:G
|:"G" B B/c/ d g |"D" f c c/B/ c | A A/B/ c/d/ e/f/ |"^D/C/am" e"G" d/c/ B/c/ d |"G" B B/c/ d g | 
"D" f c c/B/ c | a a/g/ f/d/ e/f/ |"G" g b g z ::"G" B d B d |"D" c/B/ c/d/"^C/am" e c | 
"D" A c A c |"^D/C/am" e"G" d/c/ d B |"G" B d B d |"D" c/B/ c/d/"^C/am" e2 |"D" a a/g/ f/d/ e/f/ | 
"G" g b g z :|  