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
['g2 gf e2 e2 dedc B2 Bc', 'G4 G2 c2 c2 e2 dedc B2', 'gfge fe d2']  
X:1
L:1/8
M:4/4
K:G
 g2 gf e2 e2 | dedc B2 Bc | d2 G2 A2 c2 | B3 A G4 :| G2 c2 c2 e2 | dedc B2 Bc | d2 G2 A2 c2 | 
 B3 A G4 :| gfge fe d2 | gfge fe d2 | gfgf e2 a2 | f2 e2 d2 Bc | g2 gf e2 e2 | dedc B2 Bc | 
 d2 G2 A2 c2 | B3 A G4 :|  