Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:4/4
K:Gmin
['BGBd ecfe dBd=e fcAF GBAD EGFB, CED=F', 'G a bga^f g2 d=e fdcB AcfA']  
X:1
L:1/8
M:4/4
K:Gmin
 d | BGBd ecfe | dBd=e fcAF | GBAD EGFB, | CED=F G<GGd | BGBd ecfe | dBd=e fcAF | GBAD EGFB, | 
 CED=F G<G G || a | bga^f g2 d=e | fdcB AcfA | Bdfd cege | dg^fa g<ggd | gbad egfB | cedG ^FGAD | 
 GBAc Bdce | dBcA G<G G ||  