Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:4/4
K:G
['D2 DE G2 GA']  
X:1
L:1/8
M:4/4
K:G
 (GE) |"G" D2 DE G2 GA | BGBd"C" cBAG |"D" FGFE DEFG | AFdF E2 (EF) |"G" D2 DE G2 GA | BABd efge | 
"C" dcBA"D" GFGA |"G" B2 G2 G2 :: B2 |"G" g2 g2 gbag |"D" f2 f2 fagf |"Em" e2 ef (gf)ed | 
"Em" B2 e2 e2 (ge) |"G" dBGB d2 d2 |"C" edef"G" g2 (fe) |"C" dcBA"D" GFGA |"G" B2 G2 G2 :|  