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
['G2 G Gge dBG G2', 'dBd dBd gag gfe']  
X:1
L:1/8
M:6/8
K:G
 d | G2 G Gge | dBG G2 A/B/ | cBc EFG | AFA DEF | G2 G Gge | dBG G2 (A/B/) | cAc E2 F | G3 G2 :: 
 B/c/ | dBd dBd | gag gfe | dBd dcB | AFD D2 (B/c/) | dBd dBd | gag gfe | dcB AGF | G3 G2 :|  