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
['', 'DEGA (BA)Bc (de)dB (AG)(GA) B2 (BG)', 'B2 (BG)']  
X:1
L:1/8
M:4/4
K:G
 (GE) |: DEGA (BA)Bc | (de)dB (AG)(GA) | B2 (BG) AG !>!G2 | GAGE EDB,D | DEGA (BA)Bc | 
 (de)dB (AG)(GA) | B2 (BG) BGGE | D(EGA) (G2 G2) :: g2 (gd) edBg | B2 (BG) AGEG | DEGA BABc | 
 dedB AGGA |1 g2 (gd) edBg | B2 (BG) AGEG | DEGA BABd | DEGB !>!A2 G2 :|2 DEGA (BA)Bc | 
 (de)dB (AG)(GA) | B2 (BG) AGGE | DEGB !>!A2 G2 ||  