Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:9/8
K:G
['G3 GBA', 'A BAG']  
X:1
L:1/8
M:9/8
K:G
 G3 GBA GED | A3 AB/c/d cBA | G3 GBA GED | EAE GAB GED | GDG B2 A GED | A3 AB/c/d cBA | 
 G3 GBA GB/c/d | edB dBA GAB || c2 A BAG AGE | G3 G2 E DEG | c2 A BAG d2 A | BAG G2 D GAB | 
 c2 A BAG AGE | G3 G2 D GAB | d3 d2 A BAG | AGE E2 G cBA ||  