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
['cAAc B3', 'g2 bg']  
X:1
L:1/8
M:4/4
K:G
|: Bc | dGBd cAAc | B3 d gfde | c2 de ed e/f/g | fdcB cAAc | B3 A G3 B | DGBd cAAc | d3 e fdeg | 
 fdcA G2 :: Bc | dgbg g2 bg | g2 bg dcBc | de=fe d3 c | de=fe dcBc | dg f/g/a g2 fg | abag fdde | 
 =f2 ed cA A2 | BdcA G2 :|  