Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
Q:1/8=180
M:6/8
K:G
['B2 B BAB def']  
X:1
L:1/8
Q:1/8=180
M:6/8
K:G
 B2 B BAB | def gdB | A2 A AGA | Bde dBA | B2 B BAB | def gfg | eaa a2 g | fdd d2 c | B2 B BAB | 
 def gdB | A2 A AGA | Bde dBA | B2 B BAB | def gfg | eaa a2 g | fdd def | gag gfe | d2 d dcB | 
 A2 A AGA | Bdd def | g2 g ffe | d2 d d^cd | eaa a2 g | fdd def | gag gfe | d2 d dcB | A2 A AGA | 
 Bdd def | g2 g ffe | d2 d d^cd | eaa a2 g | fdd d3 ||  