Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/16
M:2/4
K:G
['GBdB cBAG', 'D2D2 GBeB cBAG cBcd efge dedc BGAF', 'G2 d2 gfga gfed cBcd c2c2 agab', 'd2(ef) gfga gfed cBcd efge dedc BGAF']  
X:1
L:1/16
M:2/4
K:G
 A2 | GBdB cBAG | cBcd c2(BA) | GBdB cBAG | d2DD D2D2 || GBeB cBAG | cBcd efge | dedc BGAF | 
 G2G2 G2 :: d2 | gfga gfed | cBcd c2c2 | agab agfe | f2dd d2(ef) || gfga gfed | cBcd efge | 
 dedc BGAF | G2G2 G2 :|  