Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:6/8
K:G
['d2 c BAG', 'ABG ABG', 'fgf efe def gag fed e3']  
X:1
L:1/8
M:6/8
K:G
 d2 c | BAG ABA | GBc d2 c | BAG A3 | G3 |]S AB!f!G | ABG ABG | A3 c2 B | A2 G FGA | D3 ABG | 
 ABG ABG | A3 c2 B | A2 G AGF | G3 |] ga!f!g | fgf efe | def gag | fed e3 | d3 gag | fgf efe | 
 def gag | fed e3 | d3S |]  