Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:2/2
K:G
['fgag fd d2', '']  
X:1
L:1/8
M:2/2
K:G
 F |"G" G2 Bd gdBG | DEGB"C" AE E2 |"G" GABd gdBd |"C" ecBc AGEF |"G" G2 Bd gdBG | DEGB"C" AE E2 | 
"G" GABd gdBd | ecAc BG G || g |"D" fgag fd d2 |"G" gfga bgeg |"D" fgag fd d2 | fdef"G" g2 (3def | 
 gbaf g2 bg |"D" fgag fd d2 | fded fd d2 | fdef"G" gedB ||  