Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/16
Q:1/4=90
M:3/4
K:G
['.B2(BA) .G2(GA) B2G2 c2A2 A4 c2A2', 'd2d^c d2d^c d2g2 d2cB c4 (ABcA)']  
X:1
L:1/16
Q:1/4=90
M:3/4
K:G
 .B2(BA) .G2(GA) B2G2 | c2A2 A4 c2A2 | B2G2 .G2(AB) (FGAB) | .A2(AG) .F2(FE) (DFGA) | 
 .B2(BA) .G2(GA) B2G2 | c2A2 A4 c2A2 | B2d2 .F2(FG) .A2(AB) | .G2(GF) G2B2 G2 z2 || 
 d2d^c d2d^c d2g2 | d2cB c4 (ABcA) | .B2(Bc) .B2(Bc) (edcB) | .A2(AB) .A2(AB) .A2(AB) | 
 d2d^c d2d^c d2g2 | d2cB c4 (ABcA) | A2(AB) A2(AB) A4 |"^supposed" .G2(GF) G2B2 G2 z2 |]  