Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:6/8
K:Amix
['Aaa a^ga Agg', 'dcB Aaa a^ga Agg gfg Aaa agf', 'cBA cee dff']  
X:1
L:1/8
M:6/8
K:Amix
 Aaa a^ga | Agg gfg | Aaa agf | efd edB | Aaa a^ga | Agg gfe | f3 gfe | ded dcB || Aaa a^ga | 
 Agg gfg | Aaa agf | efd efg | agf gfe | fed edc | Bgg gfg | dBG Bcd |: cBA cee | dff cee | 
 cBA cee | dff fed | cBA cee | dff cee | Bgg gfg | dBG Bcd :|  