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
['G3 A', 'G2 Bc dcBc edBG (3ABA EF AGFE']  
X:1
L:1/8
M:4/4
K:G
|: c/B/A | G3 A BDEF | GBAG FGAc | dgfe dcBc | (3dcd ed cAFA | G3 A GBdB | cBAG FGAc | dgfe dcEF | 
 AGGA G2 :: Bc | dcBc edBG | (3ABA EF AGFE | DddB cAEF | GB (3AGF GDBD | GD D2 GBdB | cBAG FGAc | 
 dgfe dcEF | AGGA G2 :|  