Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
Q:1/8=232
M:4/4
K:G
['GA BA']  
X:1
L:1/8
Q:1/8=232
M:4/4
K:G
|: e | d2 GA BA Be | dG GA BA Ae | dB GA BA Bd | ef ge dB Be | d2 GA BA Be | dG GA BA Ae | 
 dB GA BA Bd | ef ge dB Bd | g2 ge f2 fd | e2 ec dB Bd | g2 ge f2 fd | ef ge dB Bd | ga ge fg fd | 
 ef ge dc BA | GF GA BA Bd | ef ge dB B :|  