Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/16
Q:1/4=80
M:2/4
K:G
['GBdB G2g2', "d4 afaf d2d2 bgbg d2ab c'2b2a2g2 gfef"]  
X:1
L:1/16
Q:1/4=80
M:2/4
K:G
 GBdB G2g2 | d2d2d2g2 | f2e2d2c2 | B2A2G2F2 | GBdB G2g2 | d2d2d2 ga | afge fde^c | d2d2 d4 :: 
 afaf d2d2 | bgbg d2ab | c'2b2a2g2 | gfef d2B2 | GBdB G2g2 | d2d2d2 bc' | d'bc'a bgaf | g2g2 g4 :|  