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
['BGA B2 d gef ged', 'gba ged B2 d def gfe fed']  
X:1
L:1/8
M:6/8
K:G
 BGA B2 d | gef ged | B2 B AGA | BGE EGA | BGA B2 d | gef ged | (3Bcd B AGA | BGF G2 A | BGA B2 d | 
 gef ged | (3Bcd B AGA | BGE E2 F | GEG FEF | EFG B^cd | edB AGA | BGF GBd || gba ged | B2 d def | 
 gfe fed | Bee e2 f | g2 g faf | gfe def | gdB AGA | BGF G (3ABd | gba ged | B2 d def | gfe fed | 
 Bee e2 f | g2 g faf | gfe def | gdB AGA | BGF G2 A ||  